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The Eartec UL4S is a professional full duplex intercom for four people that need to communicate and work with their hands. This compact system features four UltraLITE single ear wireless headsets one Master that sets the digital sequence and three Remote headsets. UltraLITE utilize Digital Enhanced Cordless Technology DECT to provide professional simultaneous wireless communication within a quarter mile range. The UltraLITE series are a breakthrough 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.