Mini Bluetooth speaker
Function: TF card, Bluetooth hands-free calls, 
Material: Metal
Power supply: USB3.7V/500MAH
Output power: 3W,
SNR: ≥ 86dB
Distortion: ≤ 0.5%
Audio input: 3.5mm
Frequency: 65Hz-20KHz
Built-in lithium battery, overweight bass,
Unique design: volume adjustment ring rotation