wireless bluetooth speaker, portable sound box

BT version: 4.1.
Power supply: 5V DC.
Output power: 3W (1kHz, THD10%)
Speaker: 40mm.
Transfer distance: 10m.
Frequency response: 280Hz - 16kHz.
SNR: >65dB.
Impedance: 4Ω
Li-ion Output: 5V
Li-ion input: 3.7V~4.2V+0.05V
Working temperature: -10C-50C. Interface: micro USB.
Battery capacity: 400mAh.
Charging time: 2 hours
Support card: TF card.
Housing material: metal.
Dimensions: 71 x 71 x 45mm.
Weight: 178g.