IPX5 Waterproof & Widely Application: This bluetooth marine radio is made to resist the marine environment. IPX5 marine grade construction and UV coatings let you don't need to worry about humidity and saltwater exposure. This waterproof boat stereo is standard tachometer gauge design, required cutout: 2.89inch (diameter) x 2.84inch (depth), It perfects for Boats, Yacht, Motorcycles, Motorbikes, Cars, ATV, UTV, SUV, RV, Golf, Campers, RZR, Harvesters, Truck and more. Bluetooth A2DP Music Streaming: This MP3 boat audio lets you enjoy your streaming music via Bluetooth 5.0 technology. You can wirelessly connect all your favorite devices like smartphone, iPad, tablet, etc. to the marine bluetooth receiver and play your spotify/pandora music with the stable bluetooth signal. Power-off Memory is supported, so the unit can automatically enter track played before last power outage. Multiple Entertainment Connection & FM AM Radio: This round marine system has USB 2.0 port and 3.5 mm auxiliary input jack, which is available for audio entertainment with MP3 player, phones, USB flash drive(up to 32 GB) and more. This FM AM marine stereo features 18 FM station memory and 12 AM station memory for your favorite real-time music, news, traffic condition, etc. Lossless Music Experience: This marine gauge stereo supports RCA subwoofer audio output and 4x50W amplifier audio output, lets you immerse in rock music. What's more, freely control bass/treble/balance/fader and custom preset EQ in the boat audio lets you easily find your music style and enjoy lossless music. Friendly note: working voltage is DC 12V; max power output is 4x50W. There is also a USB input allowing you to listen to music stored on a thumb drive. You can plug in any audio device to the auxiliary input. There is a built in radio with crystal clear reception as well. Segmented LCD Display