This Pyle Hydra iPod/MP3 to stereo RCA is the adaptor you need to pipe your favorite MP3 player?s tunes over your marine audio system. The 12 ft. adaptor allows a direct connection of any headphone equipped audio device to the RCA inputs on your head unit. It comes with a 3 ft. male-to-male 3.5mm cable ? plug one end into the MP3 player, the other into the adaptor. Also comes with a mounting diagram so you can install it with that professional factory finish look. Best of all, this adaptor is completely waterproof!