The VH-310 is a submersible telephone handset capable of remotely controlling all radio and DSC functions of Standard Horizon Class D DSC VHFs. When connected to MATRIX GX3000S, PHANTOM PS2000 or QUANTUM SERIES allows remote control PA and FOG signaling. Additional features include Intercom from the VH-310 to the connected radio, and intercom capability from between remote microphones and the connected radio. The VH-310 can be extended using the CT-100 23-foot extension cable to 70-feet. Supplied with a wall mount cradle; routing cable and a waterproof panel mount connector. For the ease of adding an external speaker, a pair of speaker wires is supplied on the rear of the routing cable so you do not need to pull additional wires.