Nokia RM-464 User Manual page 124

Hearing aids
Some digital wireless devices may interfere with some hearing aids.
If interference occurs, consult your service provider.
Warning:
Your mobile device model complies with FCC rules governing hearing
aid compatibility. These rules require an M3 microphone or higher
value. The M-value, shown on the device box, refers to lower radio
frequency (RF) emissions. A higher M-value generally indicates that
a device model has a lower RF emissions level, which may improve
the likelihood that the device will operate with certain hearing aids.
Some hearing aids are more immune than others to interference.
Please consult your hearing health professional to determine the M-
rating of your hearing aid and whether your hearing aid will work
with this device. More information on accessibility can be found at
www.nokiaaccessibility.com.
Setting for telecoil hearing aid users
This device includes a setting for direct connection to telecoil-
equipped hearing aids. When both the telecoil hearing aid (T switch)
and the phone telecoil are activated, using the device with the aided
ear will provide a direct connection for audio through your hearing
aid. The quality of sound depends on the type of hearing aid used.
You should test the device with the telecoil setting activated to
determine whether your audio performance improves. Using the
telecoil hearing-aid setting consumes additional battery power.
124
For hearing aid compatibility, you must turn off the
Bluetooth connectivity.