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This space saving Polk waterproof (IPX6 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.