See Our Other Listings. The MGR300B stereo packs a lot of features into a compact round, gauge style design that fits into a standard gauge opening. The large backlit LED display lets you see what you’re hearing with just a glance, while the IPX6-rated water-resistant face panel and big, easy-to-use controls are made to resist sun, salt, and moisture. The marine digital media receiver. White LCD Display with Blue Back-lit Illumination. Water-proof, conformal coated circuit boards. 240 Watts peak power. Mounting hole – 3 Round. Chassis type – Gauge style. MGR300B Stereo head unit. We do not mark merchandise values below value or mark items as “gifts” – US and International government regulations prohibit such behavior.