Series 3800 Vehicle Intercom Systems are engineered to solve the problem of communicating in high noise enviornments, especially those associated with emergency operations during call resposne and at the scene. The David Clark systems enable personnel on the apparatus to communicate clearly, without interference from vehilce noise, including sirens. They have the option of connecting ot moible radios, allowing all personnel to listen to the radio and selected statiosn to transmit over the radio. The "heart" of the system, the U3800 Master Station, on each is required per system. The U3800 will accomodate two headsets and should be placed where radio transmit function is not required. Adjusts automatically for 12 or 24 VDC power source. Contains system on/off, master volume control, two headsets jacks with listen level controls, power input connector and two remote output connectors.