JBL REM40GSWFull-Featured Wireless RF Remote for use with JBL Receivers Weatherproof2-9/16"" round shape that fits into the center of a steering wheelBacklit silicone rubber membranesSealed tack switchesRF means that this remote can be used virtually anywhere on the boat-it doesnt have to be directly in sight of the stereoPackage includes handheld piece (as shown above right) two adapter rings receiver and din-to-amp plugInstallation size: 2 1/4"" or 2""Product : JBL REM40GS WIRELESS RF REMOTE WITH RECEIVER F/ALL STEREOS Manufacturer : JBL AUDIO Manufacturer Part No : REM40GS UPC : 648701274018 SKU: CW28557