See also:

Voice command system
Voice command system 1) OFF hook switch 2) ON hook switch 3) Talk switch To turn on the voice command system, press the talk switch briefly. To turn off the voice command system, wait for 5 sec ...

Corrosion protection
Refer to “Corrosion protection”. ...

Volume control buttons
Models without Hands-free system Models with Hands-free system Press the “+” button to increase the volume. Press the “−” button to reduce the volume. A number indicating the volume ...