Bluetooth MP3 Player Digital Stereo FM AM Audio Radio for Marine Boat Yacht Motorcycle RV Item Type: MP3 Player Material: Aluminum Alloy, ABS Battery Model: 1 x CR2025 (shipped with built in battery) Battery Capacity: 300mAh Compatible Format: MP3 IF Range: 10.7MHz Available Sensitivity: 15db Load Impedance: 4 x 4Ω Signal to noise ratio: 50db Stereo Separation: 30db (1KHz) Tone Adjustment: ±8db Audio Output: 2ch&4ch Line Out Maximum Output Level: 1.5Vrms (±3db) Frequency Response: 20Hz-20KHz Signal to noise ratio: 60db Separation Degree: 50db Radio Frequency Band: FM 87.5-108MHz, AM 522-1620KHz Features: water and dust proof, high definition Bluetooth, lossless music Suitable models: yachts, construction vehicles, excavators, forklifts, trucks, van and other vehicles