MR45C is one of the MR45 series. MR45C is the AM/FM/CD/MP3/WMA/No Sirius version. MR45C is a stereo receiver designed specifically for the marine environment with adjustable backlight display and flip down face design. Front and Back AUX-Input available for your MP3 music device, iPod« Input available for your iPod/iPhone devices and USB Input available to play your music in a USB Flash drive.