The Series 3800 Vehicle Intercom System is engineered to solve the problem of communicating in high-noise environments with a mobile vehicle platform. Fire apparatus, rescue vehicles, ambulances, command and control vehicles, airline deicers and paint stripers are but a few applications that currently benefit from the Series 3800 system. The U3816 provides isolated radio transmit capability over two separate radios for one user and radio receive for the entire Series 3800 Intercom System for both radios. It also provides a path to "daisy-chain" to another intercom module, further expanding the system beyond the Master Station. It includes one headset jack and listen level control, two individual radio PTT switches and radio receive volume controls, two system input/output connectors, two radio input connectors and two optional remote PTT connectors for C3023 Belt Stations or 40071G-04 Footswitches. With a modular design, rugged and weather-resistant enclosures and functional versatility, the Series 3800 intercom system is an ideal solution for any mobile environment requiring crisp, clear communication and effective hearing protection.