Ringing volume – set the device ringing volume (incoming call tone).
Key beep – enable/disable the key beep.
The key beep function is always ON after the factory reset.See the device back panel for more volume and sensitivity controls.
The LINE IN signal gain is achieved mechanically using a rotary potentiometer on the panel back. Microphone sensitivity is controlled in the same way. The amplifier is the same for the primary microphone attached to the device upper panel and an external microphone MIC IN. Plug the connector into the socket to switch the signal direction. This means that the two microphones are never active at the same time. The attached external microphone has the priority. The LINE OUT and integrated speaker work analogously.
