Specifications:
1.Speaker diameter:Ф40mm
2.Impedance :32?
3.Sensitivity:118dB±5dB/1KHz
4.Frequency response:20HZ-20,000HZ
5.Rated power:50mw
6.Max power:100mw
7.Audio cable:1.3m, Ф3.5mm stereo
8.Battery :300mAh
9.Standby time:70 hours
10.Working time: 15 hours continuously;
Functions:
1. built-in low power dissipation audio amplifying circuit, which can improve timbre and enhance low-frequency gain.
2. with clarity timbre, and transparent sound.
3. built-in rechargeable high capacity lithium battery, which last long  standby time.
4. include a audio cable, which can connect to other device which with audio ouput(such as Mp3, Mp4, MID, Computer, mobile phone etc).
5. comfortable and easy to operate.