Boss Audio MGR350B Marine Stereo w/AM/FM/BT/USB [MGR350B]MGR350B Marine Stereo w AM FM BT USB The Boss MGR350B digital media receiver packs a lot of features into a compact design that fits into a standard gauge opening. Crank up some AM FM radio, or plug a compatible device into the rear USB or AUX inputs. And if you need to know what Mother Nature's planning for later, tune in to the Weather Band. The backlit LED display lets you see what you're hearing with just a glance, while the IPX6 rated water