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FCC Hearing Aid Compatibility (HAC) 
Regulations for Wireless Devices 
The U.S. Federal Communications Commission (FCC) has 
established requirements for digital wireless mobile devices 
to be compatible with hearing aids and other assistive 
hearing devices. 
When individuals employing some assistive hearing devices 
(hearing aids and cochlear implants) use wireless mobile 
devices, they may detect a buzzing, humming, or whining 
noise. Some hearing devices are more immune than others 
to this interference noise, and mobile devices also vary in the 
amount of interference they generate. 
The wireless telephone industry has developed a rating 
system for wireless mobile devices to assist hearing device 
users find mobile devices that may be compatible with their 
hearing devices. Not all mobile devices have been rated. 
Mobile devices that are rated have the rating on their box or 
a label located on the box. 
The ratings are not guarantees. Results will vary depending 
on the user's hearing device and hearing loss. If your hearing 
device happens to be vulnerable to interference, you may not 
be able to use a rated mobile 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 
Health and Safety Information  
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