This stereo has no CD player. It also will play your digital MP3 files when you connect your MP3 player or Flash drive to the rear USB port. The unit also supports Bluetooth for wireless music streaming from your iPhone / Android or similar Bluetooth device. Line out is also provided for connectivity to a external amplifier. Input Types:Bluetooth, USB, AUX. Outputs:1 pair RCA Pre-Amp Out, One Way Input Ideal for:Car, motorcycles, yacht, fishing boats, cuddy cabins, ski boats, the unit is also perfect for spa pools, quad bikes, golf carts, UTV, ATV and RV. IPX5 Waterproof & Widely Application. The radio is equipped with IPX5 waterproof design & newest weatherproofing techniques. You can use it for Boats, Yacht, Gauge, ATV, UTV, SUV, RV, Golf, SPA FOW Rooms, Swimming Pools, BAND Campers, RZR, Harvesters, AMS Truck and more. This boat stereo can connect Bluetooth and play audio streaming from external devices. ID3 tag song readout and power off memory is supported. Support Multiple Entertainment Modes. Let you enjoy different modes audio entertainment. Easily find your music style in 200W high power amplifier style. Subwoofer audio output and custom EQ settings. Marine Stereo Function and Definition of wires. How to Install? (1) Cut a hole in the dash board at least 3.75 depth. (2) Slide the included spring washers B over the screw posts A and attach the screw posts to the back of the radio. (3) Complete the wiring connections and make sure it’s connected properly (4) Insert the unit into the mounting hole. (5) Place the “u” bracket C over the screw posts and secure the radio to the dash using the included hex nuts D. (6) Cut the score marks E to fit the bracket length for your application.