AASTRA 600d for OpenCom 1000 User Guide (with bookmarks) EN - Manual (Page 92)

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Key click Switch the key click on or off.
Noise detection
Switch the automatic noise detection for a louder ringer on or off.
Loud environment
Adapt the speech quality in a loud environment.
Silent charging
Switch the "Silent charging" on or off.
LED incoming call
Switch the LED display for an incoming call on or off.
Devices menu