ZTE ZMAX - Manual (Page 167)

165
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- 2011). 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 in finding 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.