C79 User manual
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because volume is increased and background noise and feedback are diminished. The
HAC setting improves only the calls you listen to through the earpiece. Turn off the
Bluetooth function. It does not affect calls heard on the speakerphone or with a headset.
HAC requires extra battery power, so watch your battery consumption when it's turned on.
CAUTION: Do not turn on the HAC setting unless you use a hearing aid with a telecoil.
Using this setting without a hearing aid or with a hearing aid without a telecoil may be
harmful to your hearing.
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