Widex M-DEX User Instructions

INTENDED USE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 BATTERY STATUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 BLUETOOTH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 ROOM OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 OPERATING RANGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 LANYARD USAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 GETTING STARTED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 CHARGING THE BATTERY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 TURNING ON THE M‑DEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 TURNING OFF THE M‑DEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23 STANDBY SCREEN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 MANUAL KEYLOCK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 4

CHANGING PROGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 ADJUSTING THE VOLUME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 CHOOSING LISTENING FOCUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 ROOM OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 BASIC FUNCTIONS – MOBILE PHONE . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 PAIRING THE M-DEX WITH YOUR MOBILE PHONE . . . . . . . . . . . . . . 36 MOBILE PHONE CONVERSATIONS VIA THE M-DEX . . . . . . . . . . . . . . 42 ACCEPT OR REJECT CALL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 END CALL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 MAKING A CALL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 USING THE CALL LOG TO MAKE A CALL . . . . . . . . . . . . . . . . . . . . . . . . 46 TRANSFER CALL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 HANDS-FREE OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 OTHER FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51 ADJUSTING THE VOLUME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 ROOM OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 5

BLUETOOTH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 AUDIO INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 L/R VOLUME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 M-DEX T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80 WARNINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82 SAFETY WARNING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85 IN CASE OF MALFUNCTION.... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86 REGULATORY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90 SYMBOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .123 6

 1. On/off  2. Yes (green)  3. No (red)  4. Volume up  5. Volume down  6. Previous  7. Next  8. Menu  9. Room Off 10. FreeFocus 11. Microphone 7

on the product, please contact your hearing care professional . 8

read this booklet care fully before you start using the device . M-DEX is an advanced hearing aid remote control . M-DEX repro- duces mobile phone conversations directly in the hearing aid and allows the user to control normal mobile phone functions and lis- ten to audio input, using a Bluetooth connection for compatibility with most models of mobile phone, and WidexLink for connection to Widex hearing aids . INTENDED USE The M-DEX is a wireless device intended for mobile phone applications, as well as an advanced remote control . 9

and Room Off status in the upper right corner of the start screen . BATTERY STATUS Full Low 10

When using it as a remote control up to 1 meter/3 feet With mobile phones, Bluetooth and transmitted audio input, incl . M-DEX T up to 50 cm/1½ feet From the M‑DEX to mobile phone up to 10 meters/ 30 feet 13

plastic holder at the end of the lanyard provided, as illustrated . 14

your neck (1), to make it easier to unsnap . 15

• In order to show caution, we advise to follow the guidelines recom- mended by manufacturers of defibrillators and pacemakers regard- ing use of cell phones: • If you wear an active implantable device keep the Wireless Hearing Aids and Hearing Aid Accessories such as wireless remote controls or communicators at least 15 cm/6 inches away from the implant . • If you experience any interference, do not use the hearing aids and/ or hearing aid accessories and contact the manufacturer of the im- plant . Please note that interference can also be caused by power lines, electrostatic discharge, airport metal detectors etc . • If you have an active brain implant, please contact the manufacturer of the implant for risk evaluation . If you have an implantable device, we advise to keep magnets* at least 15 cm/6 inches away from the implant . (*= can be specified as Auto- phone magnet, hearing instrument case, magnet in a tool, etc .) 16

The M-DEX uses a rechargeable battery . When fully charged, the battery has a capacity of approx . 5 hours of continuous use (when on standby, the battery will last approximately three days . If Blue- tooth is turned on, this period will be considerably reduced) . The charger is available in four country versions . The version you have may therefore not look exactly as illustrated in this booklet . 17

1 . Connect the charger to the M-DEX . 2 . Plug the charger into a wall socket . 18

time . Allow the battery to charge for the full six hours, even if the “battery full” icon appears . Recharging takes approx . 3 hours, depending on whether the device is turned on or off . WARNING Do not attempt to change the battery . Contact your hearing care professional . 19

configured by the hearing care professional in cooperation with you . Your dispenser will have matched the M-DEX with your hearing aids . Once this is done, you will be able to change programs and adjust the volume in your hearing aids . 21

To turn the M‑DEX off Push the slide button on the right side of the M-DEX downward . 23

mode when it has not been used for 10 seconds . To leave standby mode Use any key except the on/off button . If the other keys are locked, you can use the “No” key to leave standby mode . 24

To activate the keylock Press No ➞ Menu 25

From the start screen you can change programs in your hearing aid, adjust the volume, choose listening focus and activate/deac- tivate Room Off . Except when using the Room Off function, your hearing aids will produce speech messages or tones when you change settings, unless the function has been deactivated by your hearing care professional . If a check mark is displayed, it means that the specific function has been activated . CHANGING PROGRAM The selection of listening programs in your M-DEX depends on how many and which programs you have chosen to have in your hearing aid . The order of the programs is the same as in your hearing aid . 27

sen as program number 1 by you and your hearing care professional (usually the Master program) . To navigate through the available programs Press  or  Every time you press one of the arrows, an icon representing the active program is displayed . 28

To access the volume bars Press  or  To increase or decrease the volume in both hearing aids Press  or  The volume adjustment will apply only to the listening program that is currently active . The wider bar in the middle indicates the default setting . The icon displayed reflects the number of volume adjustment steps chosen by your hearing care professional in consultation with you . 29

seconds . To close it manually, press the No key . Changing to another program or turning the M-DEX off will cancel any volume adjustment . If you adjust the volume on the hearing aid’s volume control, this adjustment will not be copied into the M-DEX . To adjust the volume of your two hearing aids separately, see “Advanced functions” . 30

The FreeFocus feature allows you to focus on sound from a specif- ic direction with your hearing aids . Press the FreeFocus key The FreeFocus key lights up to indicate that FreeFocus is activated . 31

from the front Press  ➞ Menu To focus on sound from behind Press  ➞ Menu 32

from the right Press  ➞ Menu To focus on sound from the left Press  ➞ Menu 33

mark confirms your choice . You can “unlock” your choice by pressing Menu again . To adjust the volume in FreeFocus First, choose the direction of focus and lock the setting . Then use the same procedure as for the hearing aids’ listening programs . To deactivate FreeFocus Press the FreeFocus key 34

allows you to use the feature to listen directly to transmitted au- dio sound without interference from surrounding sounds, or as a mute function with your normal listening programs (e .g . Master) . To activate Room Off Press the Room Off key . The Room Off key lights up and the Room Off icon is displayed . To deactivate Room Off Press the Room Off key again 35

PAIRING THE M‑DEX WITH YOUR MOBILE PHONE When you use the M-DEX with your mobile phone for the first time, you will need to pair the two devices . 1 . Turn on Bluetooth on your mobile phone . 2 . Turn on Bluetooth on your M-DEX . To to this: 2a . Press the Menu key from any program screen . This screen is displayed . 36

2c . Press the Menu key to turn on BT . This screen is displayed . 38

user instructions for your phone to see how to do this . 39

devices . To do this: 4a . Press  or  to go to pairing 4b . Press the Menu key 4c . Press the Menu key again to start pairing . You can follow the progress on the screen . 5 . Select the M-DEX on your phone, and enter the pin code (0000) displayed on your M-DEX into your phone, if prompted . 40

If no device can be detected, “Device not found . Try again?” will be displayed on your M-DEX . NOTE The next time you want to use M-DEX with your mobile phone, make sure that Bluetooth is turned on in both units . Please note that using the devices with Bluetooth turned on will significantly increase their bat- tery consumption . 41

Hold the M-DEX as you would hold a phone and speak into the mi- crophone . The sound will be heard in both hearing aids . The mobile phone must be within range (up to 10 m/30 feet) . Mobile phone M-DEX 42

to the following functions: 1 . Accept or reject call 2 . End call 3 . Transfer call 4 . Make a call 5 . Hands-free operation 43

When you receive a call, you will hear your mobile phone ringing, and if the M-DEX is within range of your hearing aids, you will also hear a tone in these . You can choose to accept or reject the call by selecting “Yes” or “No” . 44

Press End MAKING A CALL To make an outgoing call Dial the telephone number on your mobile phone and use the M-DEX as described on page 42 . 45

To make a call to one of the last five numbers registered in the Call log: Press the Yes key Use the  or  key to choose the desired number . Press the Yes key . Arrows indicate whether it is an incoming or outgoing call . To leave Call log: Press the No key . 46

mobile phone . To transfer a call to the mobile Press Transfer ➞ Yes A check mark confirms your choice . 47

speak into its microphone . Max 30 cm 49

• In order to show caution, we advise to follow the guidelines recommended by manufacturers of defibrillators and pacemakers regarding use of cell phones: • If you wear an active implantable device keep the Wireless Hearing Aids and Hearing Aid Accessories such as wireless remote controls or communicators at least 15 cm/6 inches away from the implant . • If you experience any interference, do not use the hearing aids and/ or hearing aid accessories and contact the manufacturer of the im- plant . Please note that interference can also be caused by power lines, electrostatic discharge, airport metal detectors etc . • If you have an active brain implant, please contact the manufacturer of the implant for risk evaluation . If you have an implantable device, we advise to keep magnets* at least 15 cm/6 inches away from the implant . (*= can be specified as Autophone magnet, hearing instrument case, magnet in a tool, etc .) 50

You can adjust the volume during a telephone conversation . To access the volume bars Press  or  To increase or decrease the volume Press  or  ROOM OFF You can also use the Room Off function during phone conversa- tions . See page 35 . 51

the Menu key once and using  or : If you use , the menu items are placed in the following order 1 . Bluetooth * 2 . Audio Input * 3 . L/R volume 4 . M-DEX T * 5 . Settings Choices made in options 1, 2 and 5 will be confirmed by a check mark . Because items 1, 2 and 4 involve transmitted sound, the sound in your hearing aids will be affected every time you confirm a choice in these options . When you leave these functions, you will return to program 1 . * The M-DEX must be within a range of 50 cm/1½ feet of the hearing aids. 52

available (indicated by a blue colour) if Bluetooth is activated in your M-DEX and this is connected to a Bluetooth unit . Otherwise it will be greyed out . 53

Bluetooth transmission, it must be within range of the hearing aids (up to 50 cm/ 1½ feet) . 54

• In order to show caution, we advise to follow the guidelines recom- mended by manufacturers of defibrillators and pacemakers regard- ing use of cell phones: • If you wear an active implantable device keep the Wireless Hearing Aids and Hearing Aid Accessories such as wireless remote controls or communicators at least 15 cm/6 inches away from the implant . • If you experience any interference, do not use the hearing aids and/ or hearing aid accessories and contact the manufacturer of the im- plant . Please note that interference can also be caused by power lines, electrostatic discharge, airport metal detectors etc . • If you have an active brain implant, please contact the manufacturer of the implant for risk evaluation . If you have an implantable device, we advise to keep magnets* at least 15 cm/6 inches away from the implant . (*= can be specified as Auto- phone magnet, hearing instrument case, magnet in a tool, etc .) 55

Press the Menu key . On some personal audio devices, e .g . tele- phones, the music player may need to be activated before it can play music . In the default Bluetooth setting, the hearing aid em- phasizes Music . To optimize it for Speech instead, use  or  . To confirm a new setting Press Menu key To leave Bluetooth Press No ➞ No 56

dio source such as an mp3 player . When you connect a jack plug to the audio input, the Audio input screen will automatically be displayed . The Audio input menu is only available (indicated by a blue colour) if the M-DEX and the audio source are connected by a jack-to-jack cable . 57

input, it must be within range of the hearing aids (up to 50 cm/1½ feet) . 58

• In order to show caution, we advise to follow the guidelines recom- mended by manufacturers of defibrillators and pacemakers regard- ing use of cell phones: • If you wear an active implantable device keep the Wireless Hearing Aids and Hearing Aid Accessories such as wireless remote controls or communicators at least 15 cm/6 inches away from the implant . • If you experience any interference, do not use the hearing aids and/ or hearing aid accessories and contact the manufacturer of the im- plant . Please note that interference can also be caused by power lines, electrostatic discharge, airport metal detectors etc . • If you have an active brain implant, please contact the manufacturer of the implant for risk evaluation . If you have an implantable device, we advise to keep magnets* at least 15 cm/6 inches away from the implant . (*= can be specified as Autophone magnet, hearing instrument case, magnet in a tool, etc .) 59

Press Menu . In the default Audio input setting, the hearing aid is optimized for Music . To optimize it for Speech instead, use  or  . 60

hearing aids separately . Press the Menu key 62

to adjust the volume for Use  or  to choose left or right, respectively . 63

and down Use  or  To leave L/R volume Press No ➞ No When you leave this pop-up screen, the volume in the hearing aids will be set to default level . 64

even if you do not have a telecoil in your hearing aid . If your hear- ing aid is provided with a telecoil program, we recommend using this, for optimum performance . 65

M‑DEX To enable the M-DEX to pick up teleloop signals, it should hang in a vertical position and be within range of the hearing aids . (Up to 50 cm/1½ feet) . 66

• In order to show caution, we advise to follow the guidelines recom- mended by manufacturers of defibrillators and pacemakers regard- ing use of cell phones: • If you wear an active implantable device keep the Wireless Hearing Aids and Hearing Aid Accessories such as wireless remote controls or communicators at least 15 cm/6 inches away from the implant . • If you experience any interference, do not use the hearing aids and/ or hearing aid accessories and contact the manufacturer of the im- plant . Please note that interference can also be caused by power lines, electrostatic discharge, airport metal detectors etc . • If you have an active brain implant, please contact the manufacturer of the implant for risk evaluation . If you have an implantable device, we advise to keep magnets* at least 15 cm/6 inches away from the implant . (*= can be specified as Auto- phone magnet, hearing instrument case, magnet in a tool, etc .) 67

the M‑DEX T screen Press Menu and  or  To leave M‑DEX T Press No ➞ No 68

2 . Automatic Keylock 3 . Vibrating Alert 4 . Reset Bluetooth 5 . Short-term Log 6 . Reset To select a menu item Press  or  to go to the desired item . Press the Menu key to select an item 70

You can also perform Bluetooth pairing . Bluetooth pairing See page 36 . To go back to the menu Press No . 71

turned on will significantly increase their battery consumption . 72

ample if you have your M-DEX in your pocket . If this function has been enabled, the M-DEX keys will automati- cally lock when the screen enters standby mode . Use the Menu key to turn the automatic keylock on and off To go back to the Menu Press No To unlock the automatic keylock Press No ➞ Menu 73

brating alert will alert you when you receive a call . To turn the vibrating alert on or off Press the Menu key To go back to the Menu Press No 74

This can be necessary if you change your mobile phone . To select Reset Bluetooth Press Menu To go back to the Menu Press No 75

feature allows you to make a one-minute recording of the situa- tion . This can help your hearing care professional to fine-tune your hearing aids . To start recording Press the Menu key 76

one minute and cannot be interrupted . You can follow the progress on the screen . 77

deleted . To go back to the Menu Press No 78

to: default volume, automat- ic keylock off, vibrating alarm off . To reset the settings and volume to default Press Menu To reset Bluetooth settings see page 75 . 79

Here are some things you can do to prolong the life of your M‑ DEX: WARNING • Do not expose the device to extreme temperatures or high humidity . • Do not immerse it in water or other liquids . • Do not carry your M-DEX with you during X-rays, MRIs or other scans or radiation treatments and never place it in a microwave oven . These are some of the types of radiation that can damage the device . Radi- ation from room surveillance equipment, burglar alarms, mobile phones and similar sources is weaker and will not damage the device . However on occasion radiation from devices such as certain burglar alarms, automatic motion detectors and other electronics may cause noticeable audible interference during M-DEX and hearing aid use . 80

done by authorised personnel .) • Clean the device with a soft cloth . Never clean your device with acids, alcohol, strong detergents or other liquids . • Avoid dropping the M-DEX . • When the device is not in use, keep it in its case in a dry location out of reach of children and pets . 81

and anyone else who might swallow parts of the device, or otherwise cause injury to themselves with these items . In case of ingestion, contact a physician immediately . • Do not use the device on aircraft or in hospitals without permission . • Do not use the device in mines or other areas with explosive gases . • If you wear your M-DEX around your neck, make sure that the break- away buckle on the lanyard is always at the back of your neck . • The device is made of modern non-allergenic materials . Nonetheless, in rare cases skin irritation may occur . If you notice such skin irritation, contact your hearing care professional . 82

stringent international electromagnetic compatibility standards, the possibility cannot be excluded that it may cause interference with other equipment, such as medical devices . 83

• In order to show caution, we advise to follow the guidelines recom- mended by manufacturers of defibrillators and pacemakers regard- ing use of mobile phones: • If you wear an active implantable device keep the Wireless Hearing Aids and Hearing Aid Accessories such as wireless remote controls or communicators at least 15 cm/6 inches away from the implant . • If you experience any interference, do not use the hearing aids and/ or hearing aid accessories and contact the manufacturer of the im- plant . Please note that interference can also be caused by power lines, electrostatic discharge, airport metal detectors etc . • If you have an active brain implant, please contact the manufacturer of the implant for risk evaluation . If you have an implantable device, we advise to keep magnets* at least 15 cm/6 inches away from the implant . (*= can be specified as Auto- phone magnet, hearing instrument case, magnet in a tool, etc .) 84

• Only connect a power supply that is compatible with the M-DEX . • The power supply must have an output rating of 5VDC, 500mA, and a mini USB connector . • The power supply input rating voltage and wall plug must be compatible with the AC wall outlet in your region . • The power supply must have the certification marks showing certification by a safety agency acceptable in your region . Widex strongly recommends that you always use a power supply unit that is supplied by your Widex Distributor to ensure safe and efficient use of your M-DEX . 85

Problem Possible cause Solution Your M-DEX does not work The battery is exhaust- ed Charge the battery (see page 17) Display shows “Please match with hearing aids” The M-DEX is not matched with your hearing aids Contact your hearing care professional No Bluetooth stream- ing of telephone music when activating Blue- tooth on M-DEX On some personal au- dio devices, the music player may need to be activated before it can play music Refer to the user man- ual for the telephone for further information M-DEX not vibrating when telephone rings Vibrator not activated in M-DEX The vibrator function is activated under Set- tings 86

blue but there is no connection to tele- phone M-DEX has been paired with a different device, and has established contact with it Turn BT off on the ac- tive equipment or reset Bluetooth settings and pair telephone again Your M-DEX is on but the display is black Keylock is activated Press No > Menu Sound from Blue- tooth/jack too low and/or noisy Sound not turned up loud enough Turn up the volume of the device connected to the M-DEX and turn down to a suitable vol- ume on the M-DEX M-DEX takes a long time to charge or does not charge at all Charger used is not the correct one Use the charger includ- ed with your M-DEX 87

M-DEX not the same as in the hearing aid M-DEX and hearing aid not matched correctly Ask your hearing care professional to match again Incoming call screen is shown but no tele- phone ringing tone is heard in the hearing aids Some telephones do not produce a ringing tone in the hearing aids if telephone is set to si- lent Turn off the silent func- tion on your mobile phone The M-DEX is not within range Move it within range (up to 50 cm/1½ feet) When a telephone key is pressed, the hearing aids beep and change to another program Some telephones send keypad tone to the M-DEX Turn off keypad tone on the telephone 88

not working Reset Bluetooth under Settings and pair again No sound when listen- ing to audio M-DEX is not within range of the hearing aids Slide the M-DEX up- wards on the lanyard 89

nology as it is implemented in the M-DEX. Unit M‑DEX Hearing aids Type W-link Bluetooth* W-link Antenna type Inductive antenna Embedded ceramic antenna Inductive antenna Antenna dimensions Ø6 mm L – 40mm NA Ø1 .8 mm L – 4 .85mm Modulation FSK FHSS/GFSK, π/4 DPSK, 8DPSK FSK Magnetic Field Strength -11dBμA/m at 10m distance NA -54dBμA/m at 10m distance Output power 8nW EIRP** +4dBm 29pW EIRP** Range <1m remote unit to hearing aid . <10m between M-DEX and Bluetooth device <1m remote unit to hearing aid . <30cm between hearing aids 90

10 .6MHz Channels Single channel ra- dio 5 logical channels Single channel radio Bandwidth 660kHz (-15dB) 1MHz 660kHz (-15dB) Data rate 212kbit/s raw channel capacity 2 .1Mbit/s 212kbit/s raw channel capacity Data flow Simplex or semi- duplex Time division duplex (TDD) Simplex or semi- duplex Protocol Random access – no collision avoid- ance . Packet based protocol, time divided; secure serial port pro- file (SPP) Random access – no collision avoidance . * Bluetooth specification v2 .0 + EDR published by the Bluetooth Special In- terest Group (SIG) . ** EIRP = Equivalent isotropically radiated power . Bluetooth Qualified design ID (QD ID): B017413 91

nized control of hearing aid functions. The wireless hearing aids share input information between the two partner hearing aids. In so doing, the wearers would experience the following additional user benefits (only when wearing binaural hearing aids). Synchronization of volume control settings between hearing aids – The vol- ume in both hearing aids will change when the VC is adjusted on one ear. Synchronization of listening programs between hearing aids – The same lis- tening program is used in both hearing aids when one is changed by the user. Surveillance of partner hearing aid – The hearing aid(s) will signal an alert (“partner check”) when a hearing aid battery has expired, or that one of the hearing aids has fallen off. In rare instances, a much stronger wireless source nearby may activate this alert. This serves as an early warning to the wearer of such service interruption. Coordination of compression – The hearing aids maintain the intensity level difference between ears (inter-aural level difference, ILD). In some situations where speech is presented to one side and noise the other side, this coordi- nated action could enhance the relative loudness of the speech sounds to the 92

More accurate identification of feedback – The hearing aids distinguish be- tween “true” hearing aid whistling (or feedback) and music sounds to pre- vent unnecessary feedback cancellation and preserve natural sound quality. (Contraindications): • Congenital or traumatic deformity of the ear • Active drainage from the ear within 90 days • History of rapid progressive hearing loss within previous 90 days • Acute or chronic dizziness • Sudden unilateral hearing loss in previous 90 days 93

or the M-DEX may be affected by other devices emitting a much stron- ger EM field . For example, radiation from room surveillance equipment, burglar alarms and mobile phones may cause interference . Some mo- bile phone displays and computer monitors could interfere with the wireless functions when the hearing aids are within a few cm from them . While the hearing aids are still functional, the communications between the hearing aids may be temporarily suspended until the wearers remove themselves from the vicinity of the stronger EM field . A message “partner check” may be audible . Keep at least a distance of 15 cm/½ foot from these potential interfering sources . 94

M‑DEX radio 1 (Bluetooth‑+) transmitter parameters: • Frequency (range): 2 .45 GHz (2 .4 – 2 .5 GHz) • Bandwidth : 1 MHz • Channel: 5 logical channels • Modulation: FHSS/GFSK, π/4 DPSK, 8DPSK • Radiated output power: 2 .5 mW / +4 dBm • Magnetic field strength: N/A • Duty Cycle: 100 % (averaged over 1 hour of operation) • Time division duplex (TDD) M‑DEX radio 2 transmitter parameters: • Frequency (range): 10 .6 MHz (10 .2 – 11 .0 MHz) • Bandwidth (-15dB): 660 kHz • Channel: Single channel radio • Modulation: FSK • Radiated output power: 8 nW / -51 dBm • Magnetic field strength: -11 dBµA/m @ 10 m • Duty Cycle: 100 % (averaged over 1 hour of operation) • Simplex or semi duplex capability 95

width as the corresponding transmitter. Cables and transducers: The M-DEX is using a standard 3.5 mm jack to 3.5 mm jack cable for audio input signal. 96

WidexLink wireless technology enables communication between two part- ners of a binaural pair of Widex wireless hearing aids and with their matched external devices. The requirements for the quality of service (QoS) vary among the various components and their intended user scenarios. During daily use, the requirements on audio streaming between hearing aids include a BER better than 10-3. The communication is simplex with a bitrate of 212 kbits/s. The additional audio decoding in this mode results in a longer latency which is less than 10 ms. For remote control commands the QoS re- quirements include a BER better than 10-2. The lower BER requirement re- sults from redundant transmissions. Each key press results in transmissions of 7 data packages of which only one is needed for a successful communication. 97

Security of the wireless signals is assured through device system design that includes: • Individual MAC address for each unit which is checked during each transmission . • A built-in pairing table which specifies valid and legitimate pairing among units • A proprietary Widex communication protocol which checks the pack- age numbers during each transmission . • A Cyclic Redundancy Check (CRC) to check data validity and correct errors . 98

Electromagnetic emissions The M-DEX is intended for use in the electromagnetic environment specified below. The customer or the user of a M-DEX should assure that it is used in such an environment. Emissions test Compliance Electromagnetic environment ‑ guidance RF emissions CISPR 11 Group 1 The M-DEX uses RF energy only for its internal function . Therefore, its RF emissions are very low and are not likely to cause any interference in nearby electronic equip- ment . 99

tablishments, including domestic es- tablishments and those directly con- nected to the public low-voltage power supply network that supplies buildings used for domestic purposes . Harmonic emis- sions IEC 61000-3-2 Not applicable *) Voltage fluctua- tions/ flicker emissions IEC 61000-3-3 Not applicable *) *) Battery powered equipment 100