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rechargeable batteries as these may cause
severe damage to your hearing aids.
Remove the battery if you are not using your
hearing aid for a long period of time.
Special medical or dental examination
including radiation described below, may
adversely aect the correct functioning of
your hearing aids. Remove and keep them
outside the examination room/area before
undergoing:
• Medical or dental examination with X-ray
(also CT scan).
• Medical examinations with NMRI scans,
generating magnetic elds.
Hearing aids don’t need to be removed when
passing security gates (airports etc.). If X-ray
is used at all, it will be in very low doses,
and will not aect the hearing aids.
Mobile phone compatibility rating
Some hearing aid users have reported a buzzing
sound in their hearing aids when they are using
mobile phones, indicating that the mobile phone
and hearing aids may not be compatible. According
to the ANSI C63.19 standard (ANSI C63.19-
2011 American National Standard Methods of
Measurement of Compatibility Between Wireless
Communications Devices and Hearing Aids), the
compatibility of particular hearing aids and a mobile
phone can be predicted by adding the rating for the
hearing aid immunity to the rating for the mobile
phone emissions. For example, the sum of the
hearing aid rating of 4 (M4) and a telephone rating
of 3 (M3) would result in a combined rating of 7. Any
combined rating that equals at least 5 would provide
“normal use”; a combined rating of 6 or greater
would indicate “excellent performance.”
The immunity of these hearing aids is at least
M4. The equipment performance measurements,
categories and system classications are based
upon the best information available but cannot
guarantee that all users will be satised.
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