Wired Remote Access Microphone RAM4Standard Horizon's wired remote access microphone RAM4 for Standard's GX1800, GX1800G, GX1850, GX1850G, GX2400, GX6000.Features:Controls all radio functions of the main station radio*Operate up to 2 RAM4 wired remote stationsSubmersible IPX8 waterproof rating (1.5 M or 4.92 feet for 30 minutes)Intercom feature allows you to communicate between the radio, RAM4 and Wireless RAM4W microphonesFull AIS target displayPerform all DSC functions: Individual calling, group calling, Position polling and moreLarger high resolution easy to read display with bright backlightRotary channel and volume controlsProgrammable hot keys for quick menu access23’ routing cable included3 Year Waterproof Warranty*The SSM-70H is not backwards compatible with other Standard Horizon Models