Type: Bluetooth speaker Connection method: Bluetooth connection Interface type: USB Battery capacity: 300 mA Frequency response range: 40Hz-20KHz Output power: 1 Signal to noise ratio: ≥70db Power supply mode: built-in lithium battery Channel: 2.1 Playing time: 2 Expansion storage: 16GB Bluetooth protocol: 4.0 Number of speakers: 1 Effective distance: 10 meters