Mini Waterproof Bluetooth Speaker

Product information: Type: Bluetooth Speaker Connection method: Bluetooth connection Interface type: USB Battery capacity: 300mah Frequency response range: 100HZ-20KHZ Output power: 3w Signal to noise ratio: ≥75dB Power supply: built-in lithium battery Extended storage: not supported Bluetooth protocol: 4.1 Number of speakers: 1 Effective distance: 10 meters Function: waterproof, voice prompt, dustproof, call function Operation method: button Playback format: MP3 Shell material: plastic Spe