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. | INCLUDES: 1 ULSM Single-Ear Master Headset, 2 ULSR Single-Ear Remote Headsets, 1 ULDR Dual-Ear Remote Headset, 4 Rechargeable Lithium Batteries, 10 Bay Multi-port Charger, Softside Case and cleaning cloth. | EXCEPTIONAL PERFORMANCE: Up to 1,000 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-canceling 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!