Xiaomi outdoor portable Bluetooth intelligent audio

Interface type: USB
Battery capacity: 3.7V 480mah
Frequency response range: 100Hz-20KHz
Signal to noise ratio: ≥ 75db
Power supply mode: built in lithium battery
Channel: 4.1
Playback time: 6 hours
Bluetooth protocol: 4.1
Shell material: plastic
Box material: plastic