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Safety
Solutions (ATIS). The U and UT marks are referenced
in Section 20.19 of the FCC Rules. The HAC rating
and measurement procedure are described in the
American National Standards Institute (ANSI) C63.19
standard.
When you're talking on a cell phone, it's recommended
that you turn the BT (Bluetooth) mode off for HAC.
For information about hearing aids and digital wireless
phones
Wireless Phones and Hearing Aid Accessibility
http://www.accesswireless.org/Home.aspx
FCC Hearing Aid Compatibility and Volume Control
http://www.fcc.gov/cgb/consumerfacts/hac_wireless.
html