Acer S510 - Manual (Page 60)

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These ratings are not guarantees. Results will vary, depending on the level of
immunity of your hearing device and the degree of your hearing loss. If your hearing
device happens to be vulnerable to interference, you may not be able to use a rated
phone successfully. Trying out the phone with your hearing device is the best way to
evaluate it for your personal needs.
M-Ratings: Phones rated M3 or M4 meet FCC requirements and are likely to
generate less interference with hearing devices than phones that are not labeled.
M4 is the better/ higher of the two ratings.
T-Ratings: Phones rated T3 or T4 meet FCC requirements and are likely to be more
usable with a hearing device's telecoil ("T Switch" or "Telephone Switch") than
unrated phones. T4 is the better/higher of the two ratings.
Notes:
This device does not support VoIP. WLAN and Bluetooth do not have voice
capability for held-to-the-ear phone service.
Not all hearing devices contain telecoils.
The more immune your hearing aid device is, the less likely you are to experience
interference noise from your wireless phone. Hearing aid devices should have
ratings similar to those of phones. Ask your hearing health-care professional for the
rating of your hearing aid. Hearing devices may also be measured for immunity to
this type of interference. Your hearing device manufacturer or hearing health
professional may help you find results for your hearing device. The more immune
your hearing aid is, the less likely you are to experience interference noise from
wireless devices. For additional information about the FCC's actions with regard to
hearing aid compatible wireless devices and other steps the FCC has taken to
ensure that individuals with disabilities have access to telecommunications services,
please go to www.fcc.gov/cgb/dro.
FCC
Ear Body
1.23 W/kg 0.86 W/kg
Turning on Hearing Aid Compatibility mode
To turn on HAC, open the Applications menu and tap Settings > Call settings >
Advanced settings > Hearing aids.