Clear-Com DX-100 4C Set, 2,4 GHz Wireless Intercom system for up to 4 Communicator, set consists of: mobile Basis Station MB 100 with powersupply, 2 antennas, 4 BP200 Beltpacks incl. each 2 rechargeable batteries, 4x HS15 one ear Headsets, AC40A Accu charger and manual, can be upgrated for up to 15 communicators, remote for single units possilbe, encoded signal for a safe transmission, this system is licenced free all over the world