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The RAM3+ (CMP31) allows you to remotely control all functions of Standard Horizon fixed mount VHF radios which include GX1600, GX1700, GX2000, GX2100, GX2150, GX2200, GX5000S and GX5500S. The full dot matrix display and programmable keys make operation simple and fast. Additional features include turning the radio on/off and all DSC functions including Distress. The RAM3+ (CMP31) can be extended up to 70 feet using the optional CT-100 (23 Foot) extension cable. The RAM3+ (CMP31) is backed by an industry leading 3-year waterproof warranty.