Products specifications: 

1.Loudspeaker output:1W
2.Sensitivity:82±3db
3.Input sensitivity:200MV
4.Loudspeaker impedance:4Ω±15%
5.Distortion:0.5%
6.Lithium-ion battery ouput:3.7V
7.Lithium-ion battery input:4.2V±0.05V
Suitable ambient:0±40

Dimension: 33 x 65 x 58 mm (without audio plug or retractable resonator)
Weight: 54g (including batteries)

Packing size: 13 x 7 x 9.1 cm
54g
112 pieces per carton
6.05KG NW / 17.35KG GW