13. Ring on / off
Switch the handset external call ringer on/off by long press this key.
14. Speaker
Press to activate the hands free function.
15. Mute
During a conversation, press to mute the microphone. Press it again to activate
the microphone.
16. Page
When you press it, the handset rings, so you can find it.
17. IN USE / CHARGE button
18. Telephone line input jack (LINE).
19. Power adapter input jack (DC 6V).
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