Huawei M881 Quick Start - Manual (Page 21)

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--Connect the equipment into an outlet on a circuit different from that
to which the receiver is connected.
--Consult the dealer or an experienced radio/TV technician for help.
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 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