BOSS Audio Systems MR500UAB Marine Audio Stereo System ?C Single Din . Bluetooth Audio and Calling Head Unit . AM/FM Radio Receiver . No CD Player . USB . Weatherproof . Hook Up To Amplifier . Not Touchscreen Marine Radio Receiver ?C Bluetooth Audio Streaming and Hands-Free Calling . USB Port . Weatherproof . Digital Media MP3 Player . No CD Player . AM/FM Radio Receiver Cruise along with the BOSS Audio Systems MR500UAB Weatherproof Mech-Less (No CD/DVD) Digital Media Player. Tune in to the AM/FM radio or max out your digital music options by hooking your smartphone up through the Auxiliary Input or plugging into the USB port. Hook up to Bluetooth to play and control stored music and apps like Spotify and Pandora or make calls hands-free. State-of-the-art weatherproofing materials and UV coatings provide protection from the elements.