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 stations Submersible 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 microphones Full AIS target display Perform all DSC functions: Individual calling, group calling, Position polling and more Larger high resolution easy to read display with bright backlight Rotary channel and volume controls Programmable hot keys for quick menu access 23&'; routing cable included 3 Year Waterproof Warranty *The SSM-70H is not backwards compatible with other Standard Horizon Models Specifications: Type: Microphones Box Dimensions: 4"H x 8"W x 10"L WT: 2.4 lbs UPC: 788026149018