Have a complete system of 5 radio transceivers and headsets with the 5-User SC-1000 Two-Way Radio System with Eclipse Inline PTT Headsets from Eartec. This system is designed to provide voice communication to production teams on the move. A push-to-talk button lets you quickly transmit without digging the transceiver out. Operating in the simplex mode, the message is heard by everyone in the group. You may use an unlimited number of receivers on the same frequency, as the 38 privacy codes block interference.