Product Information: Function: waterproof, dustproof, voice prompt, call function Connection method: Bluetooth connection Interface type: USB Battery capacity: 650MAH Frequency response range: 60Hz-15KHz Output power: 3W Signal to noise ratio: ≥75dB Power supply mode: built-in lithium battery Channel: 1 Play time: 8 hours Extended storage: not supported Bluetooth protocol: 5.0 Number of speakers: 1 Effective distance: 10 meters Operation mode: key operation Applicable people: general Play format: MP3, WMA, WAV Shell material: plastic Speaker adjustment method: button Cabinet material: ABS Appearance size: 12.4*9*5.3cm Packing list: Speaker*1