Standard Horizon Second Station Handset. Telephone-style handset connects to all Standard Horizon Class D VHF's and CP300, 500 and 550 chartplotters. Allows remote control of all radio and DSC functions, PA and FOG signalling. Intercom capability between radio and remote microphones. Cord can be extended STD-CT-100 extension cable(s). Includes wall mount cable, routing cable and a waterproof panel mount connector. Works with the Quest X, Matrix and Quantum radios. Submersible.