The Eartec HUB4D is a professional Full Duplex Wireless Intercom System for 4 people that need to communicate and work with their hands. This compact system features the HUB Mini base and 4 UltraLITE wireless headsets that utilize Digital Enhanced Cordless Technology (DECT) on the 1.9 GHz band. This provides professional, simultaneous wireless communication within a 1/4 mile range line-of-sight. The HUB is a revolutionary mini base station that expands the capacity of the UltraLITE linking up to 8 wireless headsets, with a wired headset jack to accommodate larger production crews. Weighing only 9 oz. the HUB can either be placed strategically "on location" or belt worn so your crew can remain in constant full duplex voice contact with the freedom of mobility. The UltraLITE headset provides breakthrough technology with all electronics, including the battery/circuit board/antennas being built right inside the earcup of the headset eliminating wires/belt-packs being exposed. The complete Eartec HUB-4D includes 1 HUB mini-base/4 UltraLITE double headsets/batteries/charger/adapter and carrying case.