See also:

Three-Way Calling
To initiate three-way calling, press the button while a call is in progress, and make a second phone call, as described under “Making a Second Call While Current Call is in Progress”. After ...

Power Switch/Volume Control (Rotary)
Push the ON/VOLUME control knob to turn on the radio. Push the ON/VOLUME control knob a second time to turn off the radio. ...

Controls
The headphone power indicator and controls are located on the right ear cup. NOTE: The rear video system must be turned on before sound can be heard from the headphones. To conserve battery lif ...