Tuner Section FM Stereo Frequency Area US, Europe. Bluetooth:long distance music Streaming. RMS Power Output:4 x 45W. Power supply:DC 12V. Waterproof level:IP66 Certification. Meets ASTM B117 salt/fog standard. Dimensions Mounting Hole:88.12mm. Dimensions Mounting Depth:70mm. Input Types:Bluetooth, USB, AUX. Outputs:1 pair RCA Pre-Amp Out, One Way Input. Car, motorcycles, yacht, fishing boats, cuddy cabins, ski boats, the unit is also perfect for spa pools, quad bikes, golf carts, UTV, ATV and RV. Mounting Hole Diameter: 97mm(3.818). Mounting Depth: 35mm/(1.37). Grill material: UV Plastic. Magnet Material: Ferrite, 4oz. Magnet Protection: Plastic Water Guard. Application: Boat, yacht, SPA, swimming pool, ATV, UTV. The 4 inch Marine Speaker has a fully waterproof design, UV and salt/fog protection. 1PCS x Marine Stereo Receiver. 1Pairs x Marine Speakers. All items will be tested in advance before sending out. It is easy for us to contact the logistics provider to inquire about the package. Marine series of head units and remotes are fully tested against UV radiation degradation as well as tested to IP66 water intrusion standards. We also fully test the stereo units for every changing environmental conditions that you may experience on the boat or out in the dunes such as temperature extremes, as well as vibration testing to make sure they can take a bump and keep performing as a high standard product. If you are dissatisfied for any reason, please donot be quick to leave negative/neutral feedback. Our working time:Monday to Friday.