This stereo has no CD player, but has the ability to stream your audio wirelessly. Built-in Bluetooth technology allows you to instantly play music via your smart devices– quickly and easily! (like iphone, android, smartphones, ipad etc). RCA AUX Audio Input. USB/ MP3 Player It also will play your digital MP3 files when you connect your MP3 player or flash drive to rear USB port (MP3 player also can be recharged). The audio screen with high definition positive LCD display and the bright LED illumination button when connect the power. Waterproof and Anti-Rust: Hit the water and enjoy your music with the marine gauge stereo. MUSIC STREAMING: This marine digital media receiver stereo radio has a built-in technology with 10 feet range for wireless audio streaming and works with all of your favorite devices like iPhone, android, smartphone, iPad, tablet, etc MULTIPLE CONNECTION: This stereo receiver system is equipped with AUX and RCA input / output connector jacks for additional audio devices and speakers. With this excellent quality Marine dashboard stereo entertainment system with 2.75 LCD digital display that lets you listen to music, Waterproof Construction you don’t have to worry about the elements! UNIVERSAL AND WATERPROOF: This radio stereo combo is made of marine grade waterproof construction in a universal compact round design that fits into standard size tachometer gauge. Waterproof Construction you don’t have to worry about the elements! Dimension: Cutout Diameter: 3.15″/80MM Mounting Depth:3.5″/90MM.