Hollyland Solidcom SE Global 5S 5-Person Full-Duplex Single-Ear Noise-Canceling Headset Intercom System (2.4 GHz). The headset also supports USB-C charging, and charging while using. Simple and easy to operate, long battery life, 12 hours for the remote headset, 10 hours for the master headset Not compatible with Solidcom C1 & C1 pro.