The master WAERO Wireless Duplex Headset from CAME-TV is a component of the duplex (2-way) communication WAERO system. This master unit can be paired with up to three slave units for a total of four headsets or when used with a hub, up to eight slave units, and a hub-linked headset to create a 10-headset system. This component is powered by a replaceable battery in the headset itself, eliminating the need for a bulky, clip-on battery pack.