Waterproof bluetooth speaker

Type: Bluetooth speaker Connection method: Bluetooth connection Interface type: USB Battery capacity: 3000mah Frequency response range: 100HZ-20KHZ Output power: 30W Signal to noise ratio: ≥75dB Power supply mode: built-in lithium battery Channel: 2 Playing time: 12h Expansion storage: 32GB Bluetooth protocol: 5.0 Number of speakers: 2 Effective distance: 10 meters Function: insert card, waterproof, dustproof, drop-proof, voice prompt, call function Operation mode: button Play format: MP3, WMA, WAV Support format: SD card