Huawei Consumer Cellular Envoy User Manual page 32

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
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