Lossless Music Experience: This marine gauge stereo supports subwoofer audio output and 4x50W amplifier output, letting you immerse in rock music. You can control bass, treble, balance, fader, and use the custom preset EQ to easily find your music style and enjoy lossless music. Friendly note: working voltage is DC 12V; max power output is 4x50W. Multiple Entertainment Connection FM AM Radio: This round marine 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 features 18 FM station memory and 12 AM station memory for realtime music, news, traffic, and other updates. IPX5 Waterproof Wide Application: This Bluetooth marine radio is designed to resist the marine environment. IPX5 marine grade construction and UV coatings protect against humidity and saltwater exposure. This waterproof boat stereo uses a standard tachometer gauge design with a required cutout of 2.89 inches in diameter and 2.84 inches in depth. It is suitable for boats, yachts, motorcycles, motorbikes, cars, ATVs, UTVs, SUVs, RVs, golf carts, campers, RZRs, harvesters, trucks, and more. Bluetooth A2DP Music Streaming: This MP3 boat audio supports Bluetooth 5.0 for wireless streaming from devices such as smartphones and tablets to the marine Bluetooth receiver with a stable connection. Poweroff memory is supported, so the unit can automatically resume the track played before the last power outage.