RF9-UART RF Wireless RemoteWaterproof Wireless RF remote compatible with JBL, Infinity and Milennia remote ready marine stereos. Features:RF radio frequency means no line of sight requiredWaterproof and floats3-3/16 High x 3/4 Deep x 2 7/16 Wide WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.