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device successfully. Trying out the mobile device with 
your hearing device is the best way to evaluate it for 
your personal needs.
M-Ratings: Wireless mobile devices rated M3 or M4 
meet FCC requirements and are likely to generate less 
interference to hearing devices than mobile devices that 
are not labeled. M4 is the better/higher of the two 
ratings.  M-ratings refer to enabling acoustic coupling 
with hearing aids that do not operate in telecoil mode.
T-Ratings: Mobile devices rated T3 or T4 meet FCC 
requirements and are likely to generate less interference 
to hearing devices than mobile devices that are not 
labeled. T4 is the better/higher of the two ratings. 
T-ratings refer to enabling inductive coupling with 
hearing aids operating in telecoil mode.
Hearing devices may also be rated. Your hearing aid 
manufacturer or hearing health professional may help 
you find this rating. Higher ratings mean that the hearing 
device is relatively immune to interference noise. 
Under the current industry standard, American National 
Standards Institute (ANSI) C63.19, the hearing aid and 
wireless mobile device rating values are added together 
to indicate how usable they are together. For example, if 
a hearing aid meets the M2 level rating and the wireless 
mobile device meets the M3 level rating, the sum of the 
two values equals M5. 
Under the standard, this should provide the hearing aid 
user with normal use while using the hearing aid with 
the particular wireless mobile device. A sum of 6 or 
more would indicate excellent performance.  
However, these are not guarantees that all users will be 
satisfied. T ratings work similarly.