Two-Mic Environmental Noise Cancellation Reliable 1.9 GHz DECT 6.0 Technology True-Wireless Headset, No Bodypack Comfortable Single-Ear Headset Design Wide Frequency Response for Clear Audio 1100' 2-Way Operating Range Mute/PTT Button or Rotate Boom to Mute Includes Batteries and Charger Expandable System Backward Compatible with Solidcom C1