User's Manual

E-30
A phone is considered Hearing Aid Compatible for acoustic
coupling (microphone mode) if it has an “M3” or “M4” rating. A
digital wireless phone is considered Hearing Aid Compatible for
inductive coupling (telecoil mode) if it has a “T3” or “T4” rating.
How will I know if my hearing aid will work with a
particular digital wireless phone?
You’ll want to try a number of wireless phones so that you can
decide which works the best with your hearing aids.
You may also want to talk with your hearing aid professional
about the extent to which your hearing aids are immune to
interference, if they have wireless phone shielding, and whether
your hearing aid has a HAC rating.
For more information about hearing aids and digital
wireless phones:
• FCC Hearing Aid Compatibility and Volume Control
http://www.fcc.gov/cgb/dro/hearing.html
• Hearing Loss Association of America
http://www.hearingloss.org/learn/cellphonetech.asp
• CTIA
http://www.accesswireless.org/hearingaid/
• Gallaudet University, RERC
http://tap.gallaudet.edu/voice
M3 + M2 = 5
T3 + T2 = 5
M3 + M2 = 5
T3 + T2 = 5