Huawei M865C - Manual (Page 77)

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interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
Caution
Changes or modifications made to this device not expressly approved by
Huawei Technologies Co., Ltd. may void the FCC authorization to operate this
device.
Hearing Aid Compatibility (HAC) regulations for Mobile phones
In 2003, the FCC adopted rules to make digital wireless telephones
compatible with hearing aids and cochlear implants. Although analog wireless
phones do not usually cause interference with hearing aids or cochlear
implants, digital wireless phones sometimes do because of electromagnetic
energy emitted by the phone's antenna, backlight, or other components.
Your phone is compliant with FCC HAC regulations (ANSI C63.19).
While some wireless phones are used near some hearing devices (hearing
aids and cochlear implants), users may detect a buzzing, humming, or
whining noise.
Some hearing devices are more immune than others to this interference
noise, and phones also vary in the amount of interference they generate.
The wireless telephone industry has developed a rating system for wireless
phones, to assist hearing device users find phones that may be compatible
with their hearing devices. Not all phones have been rated. Phones 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 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 to 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. (Note
that not all hearing devices have telecoils in them.) Hearing devices may also
be measured.
Your phone meets the M4/T3 level rating. Hearing devices may also be rated.
Your hearing device manufacturer or hearing health professional may help