Logo can be printed (contact store customer service for details) Type: Bluetooth speaker Connection method: Bluetooth connection Interface type: USB Battery capacity: 4000mAh Frequency response range: 40Hz-20KHz Output power: 20W Signal to noise ratio: 75db Power supply mode: built-in lithium battery Channel: 2 Playing time: 6 hours Bluetooth protocol: 5 Number of speakers: 3 Effective distance: 15 meters Function : None Operation mode: button Display: None Playback format: MP3 Shell material: plastic Supported formats: MP3, WMA, WAV, A2DP Speaker adjustment method: button Is there a function radio: None Box material: plastic Appearance size: 115*115*145 MM Product weight: 0.97 (KG) Packing list: manual, packing box, charger, speaker power supply: USB