1、This marine stereo has portable media functions, AM/FM radio, USB and auxiliary input for connecting portable media devices, and can be easily slid into the instrument opening or cup holder. 2、4 x 45 watts of power operation, strong power, sturdy chassis and IP66 waterproof rating, can be installed in the bathroom, durable. 3、It has an AM/FM radio and RCA Aux audio input on the back. When you connect an MP3 player or flash drive to the back USB port, it can also play your digital MP3 files. 4、This unit also supports Bluetooth, which can transfer music wirelessly from your phone or similar Bluetooth devices. A line output is also provided to connect to an external amplifier. 5、Waterproof materials plus special UV coating on plastic surfaces, coated circuit boards and connections ensure that these marine and outdoor products are corrosion‑resistant. Item Type: Marine Bluetooth Speaker Material: ABS+Metal Shell Material: Metal Purpose: Marine Speaker Remote Control Battery: CR2025 Battery Capacity: 150mah, Battery x 1 (Built-in) Waterproof: IP66 Power (Maximum): 80W Application: Car, Outdoor, Yacht, Marine ATV UTV Speaker Unit: 4 Connection Method: Bluetooth Connection Interface Type: USB Frequency Response Range: 60Hz-15KHz Output Power: 4 x 45W (Up to 50W) Signal to Noise Ratio: ≥75dB Power Supply Mode: External 12V Power Supply Channel: 5.1 Extended Storage: Not Supported Bluetooth Protocol: 2.0 Number of Speakers: 4 Effective Distance: Approx. 8m/8.75yd Operation Mode: Button Play Format: MP3 Whether to Support APP: No Support Format: U Disk Speaker Adjustment Method: Button Radio Function: Yes 1 x Speaker 1 x Bolt 1 x Nut 1 x Mounting Bracket 1 x Gasket 1 x Remote Controller 1 x Signal Wiring Harness 1 x Light Wire 1 x Manual