The MCD6 Compact Disc changer allows you to listen to six of your favorite CD's without interruption. With Poly-Planar's shock resistant CD mechanism, you can even listen to them while you are crashing through the big ones! The MCD 6 works with Poly-Planar's MRD60 and MRC50 waterproof marine stereos and can be controlled with either the receiver or one of Poly-Planar's revolutionary remote controls