Specifications:

Louspeaker output: 2W
Sensitlvity: 82+/-15%
Loudspeaker impedance: 4 +/- 15%
Distortion: 0.5%
Lithlum ion battery output: 3.6V
Lithlum ion battery input: 4.2V+/-0.05V
Suitable ambient: 0℃ +/- 40℃
Dimension: 5.0cm*5.4cm*7.3cm
Weight: 80g(including batteries)