This Eartec ULDR-HD Dual Muff Ultralite HD Remote Headset will only work with 1x Master headset or HUB. Up to 4 Remote Headsets can be used with 1x Master Headset, without the requirement of a HUB.
Features: Full-duplex / simultaneous talk wireless communication
Expandable to up to 5 users without a hub
No license, base station, wires or beltpacks required
Simple operation - just turn the headset "ON" and talk
Wear ear cup on the left or right ear
Range up to 300 meters (open air line...