Huawei KIW-A1 Manual page 15

This device complies with Part 15 of the FCC Rules. Operation
is subject to the following two conditions: (1) this device may
not cause harmful interference, and (2) this device must
accept any interference received, including interference that
may cause undesired operation.
Caution: Any changes or modifications to this device not
expressly approved by Huawei Technologies Co., Ltd. for
compliance could void the user's authority to operate the
equipment.
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
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