Caliber RMD031BT is a versatile 4 x 55W car radio with a wide range of features to enhance your driving experience. Listen to your favorite FM radio stations or connect your smartphone via Bluetooth to stream music, make calls, and more. With USB and microSD card slots, you can play your own music collection on the go. The built-in microphone allows for hands-free calling, and the intuitive control panel makes it easy to navigate through the various functions.