The Caliber RCD231BT is a powerful car audio system that combines a feature-rich FM tuner with MP3, WMA, and Bluetooth connectivity. Enjoy crystal-clear radio reception with its high sensitivity tuner and store your favorite stations with its 18 FM presets. Stream music wirelessly from your Bluetooth-enabled devices and take calls hands-free with the built-in microphone. The RCD231BT also features a front-panel USB port and SD card slot for playing music from external storage devices. With 4 x 75W of power output, this system delivers rich, dynamic sound to your car's speakers.