CONNECTS TO OPTIONAL 6-CD CHANGER OR SIRIUS SATELLITE RECEIVER! Clarion has created a new meaning for the term "Rockin the Boat" with the CMD4 Marine AM/FM CD Player. This seaworthy radio features 17 watts per channel x 4 channels and three sets of preamp outputs. The watertight faceplate and clear-coated circuit board are designed to give you years of corrosion-free operation. The CMD4 is loaded with entertainment features that are ready to provide the perfect soundtrack to your travels, no matter how far you like to roam. The CMD4 can plays back CD audio, CD-R and CD-RW discs and features a powerful AM/FM tuner for clear radio reception. Connect the optional SIRIUS satellite radio tuner for even more entertainment, with clear reception up to 200 miles off shore.