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Health and Safety Information       110
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: 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.
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.
Hearing devices may also be rated. Your hearing device 
manufacturer or hearing health professional may help you find 
this rating. Higher ratings mean that the hearing device is 
relatively immune to interference noise. The hearing aid and 
wireless mobile device rating values are then added together.
A sum of 5 is considered acceptable for normal use. A sum of 6 
is considered for best use.
In the above 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 equal M5. This is synonymous for T 
ratings. This should provide the hearing aid user with “normal 
usage” while using their hearing aid with the particular wireless 
mobile device.
“Normal usage” in this context is defined as a signal quality that 
is acceptable for normal operation. The M mark is intended to be 
synonymous with the U mark. The T mark is intended to be 
synonymous with the UT mark. The M and T marks are 
recommended by the Alliance for Telecommunications Industries 
Solutions (ATIS). The U and UT marks are referenced in Section 
20.19 of the FCC Rules.
M3                 +                    M2         =     5
T3                 +                    T2         =     5