Standard Horizon Wired Remote Access Microphone RAM4Standard Horizon RAM4 is a reliable wired remote access microphone engineered to expand your marine radio control. Designed to work with Standard's GX series, it delivers seamless, hands free operation from multiple stations while keeping essential functions at your fingertips. Compatible with: GX1800, GX1800G, GX1850, GX1850G, GX2400, and GX6000 systems, the RAM4 puts full radio control at the location you need it most. It supports up to two RAM4