Boss Audio 638B Bluetooth Enabled MP3 / CD Receiver In-dash car stereo with CD player, AM/FM tuner, and Bluetooth wireless connectivity; 25 watts RMS power x 4 channels (80 watts peak) Auxiliary audio input for connecting portable digital audio player; SD/MMC memory card slot; USB port 5-volt preamp front/rear output, subwoofer output Large white-on-black display; illuminated blue buttons; detachable front panel Compatible with CD-R/RW discs and MP3 files; includes remote control