The Hollyland Solidcom SE-Master Headset (SOLSE-HS01) is the master unit of Hollyland's Solidcom SE wireless intercom, a full-duplex, base-station-free system in which each person wears a single-ear headset with the radio built in. The master headset hosts the network, and remote headsets (sold separately or in kits) link to it, with up to five headsets per system. It is used by camera crews, church and event production teams, stage managers, coaches and referees who need simultaneous hands-free talk. It runs in the 2.4 GHz band with automatic frequency hopping and up to 350 m (1,100 ft) line-of-sight range. Dual-microphone environmental noise cancellation removes more than 20 dB of background noise, and the headset has push-to-talk and a movable boom that mutes when raised. Hollyland rates the master for about 10 hours from its 770 mAh swappable battery, with charging in under three hours. It weighs about 185 g with battery. This listing is the master headset only.