The Eartec UL4D is a professional full duplex intercom for four people that need to communicate and work with their hands. This compact system features four UltraLITE dual ear wireless headsets, one “Main” that sets the digital sequence, and three “Remote” headsets. UltraLITE utilizes Digital Enhanced Cordless Technology (DECT) to provide professional, simultaneous wireless communication within a quarter mile range. The UltraLITE series is a breakthrough system because all electronics, including the battery are built right inside the headset earcups, eliminating wires and belt worn radios. The system does not require a base station, and the headsets are field programmable, meaning that the system can be expanded at any time. No FCC License Required.