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INCLUDES: 1 ULSM Single-Ear Master Headset 3 ULSR Single-Ear Remote Headsets 4 Rechargeable Lithium Batteries 10 Bay Multi-port Charger Softside Case Solid Signal Cleaning Wipes. HANDS-FREE FULL DUPLEX: Wireless headsets operate on 1.9 GHz frequency to avoid interference with other devices; allows for simultaneous communication for 4 users. EXCEPTIONAL PERFORMANCE: Up to 1000 ft LOS wireless range; up to 6 hours of talk time on a single charge; pivoting microphone allows for the headsets to be worn on either left or right side. GREAT CLARITY: Noise-cancelling microphone that automatically mutes when pivoted upwards; high-quality voice communication even in high-noise environments. PERFECT FOR: video production stage production boat operators drone operators construction sites and more! 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. br/ br/ 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. br/ i No FCC License Required /i