MR45S is one of the MR45 series. MR45S is the full-featured stereo version. MR45S is an AM/FM/CD/MP3/WMA/Sirius Satellite Ready stereo. MR45S is a full-featured 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 from a USB Flash drive. Wired and Wireless Remotes available (sold separately).