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Operate up to 4 wireless or 2 wired remote stations** Full 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 access3 year waterproof warranty**Operation of the RAM4X (wireless) requires the use of the SCU-30 wireless base station. When the SCU-30 is used only 1 RAM4 connection will be available on the radio