This space-saving Polk IPX6 waterproof-rated remote control is compatible with the Polk PA450UM marine source unit. The PRC200BC has a full-function, sunlight-readable display and backlit buttons for easy viewing at night. It meets and exceeds the ASTM B117 salt, fog, and ASTM D4329 UV standards with a conformal-coated circuit board that resists corrosion. Surface or flush-panel mounting options can be used for user convenience. 4.25"W x 2.45"H x 0.7"D.