Connection method :Bluetooth connection Interface type: USB Battery capacity: 1200mah Frequency response range :100HZ-20KHZ Output power: 3W*2 Signal to noise ratio: ≥75dB Power supply method: built-in lithium battery Channel 2 Play time 6 hours Extended storage 32GB Bluetooth protocol 4.2 Number of speakers 2 Effective distance 10 meters Features drop-proof, voice prompt, card, radio, remote control, dustproof, call function Mode of operation Applicable people Play format MP3 Housing Material Plastic Whether to support APP Support format U disk