IPX5 Waterproof and Wide Application This round marine radio is built to withstand the marine environment. The IPX5 waterproof rating and UV coatings protect against humidity and saltwater exposure. It features a standard tachometer gauge design with a required cutout of 2.89 inch (diameter) x 2.84 inch (depth). It is suitable for Boats, Yacht, Motorcycles, Motorbikes, Cars, ATV, UTV, SUV, RV, Golf, Campers, RZR, Harvesters, Truck and more. Multiple Entertainment Connection and FM AM Radio The system includes a USB 2.0 port and a 3.5 mm auxiliary input jack for audio from MP3 players, phones, USB flash drives (up to 32 GB) and more. It offers 18 FM station memories and 12 AM station memories for quick access to realtime music, news, traffic information, and other broadcasts. Bluetooth A2DP Music Streaming Enjoy wireless music via Bluetooth 5.0 technology. You can connect smartphones, tablets and other devices to the marine Bluetooth receiver and play your music with a stable Bluetooth signal. Poweroff memory is supported, so the unit resumes playback from the last track after a power outage. Lossless Music Experience This marine gauge stereo provides subwoofer output and a 4x50W amplifier for powerful sound. It supports bass, treble, balance, and fader adjustments. Note: operating voltage is DC 12V; maximum power output is 4x50W.