Jensen USB Interface & 1/8" Auxiliary Input Jack: US interface port for connection to USB capable stereos such as MSR2107, JMS2212, and JMS7010, Waterproof design, USB port allows for connection of external storage device, 1/8" audio jack allows input of any MP3 player or external audio device. Audio connector (RCA), 10' Cable Length, For use with any stereo with USB capability and/or auxiliary audio capabilities, UV-resistant finishes/materials (meets ASTMD4329), Corrosion resistant materials (meets ASTMB117), Through hole mount with threaded housing and knurled securing nut, Mounting Hole: 1.5", Dimensions: 1.89" Diameter x 1.18" Depth.