Specification: Item Type: Marine Stereo Material: Aluminum alloy, ABS Battery Model: CR2025 x 1 built in Battery Capacity: 300mAh Compatible Formats: MP3 IF Range: 10.7MHz Usable Sensitivity: 15db Load Impedance: 4 x 4 Ohm To Noise Ratio: 50db Stereo Separation: 30db 1KHz Tone ...Specification: Item Type: Marine Stereo Material: Aluminum alloy, ABS Battery Model: CR2025 x 1 built in Battery Capacity: 300mAh Compatible Formats: MP3 IF Range: 10.7MHz Usable Sensitivity: 15db Load Impedance: 4 x 4 Ohm To Noise Ratio: 50db Stereo Separation: 30db 1KHz Tone Adjustment: ±8db Audio Output: 2ch and 4ch Line Out Maximum Output : 1.5Vrms ±3db Frequency Response: 20Hz-20KHz To Noise Ratio: 60db Separation: 50db Frequency Band: 87.5-108MHz, AM 522-1620KHz Features: Dustproof and waterproof, high definition, , lossless music Fitment: Yachts, engineering vehicles, excavators, forklifts, trucks, vans, etc. Package List: 1 x Marine Stereo 1 x Bracket 1 x Remote Control 2 x Long Screw 4 x Short Screw 2 x Nut 2 x Washer 1 x Harness Note: Receivers & Amplifiers Electronics