er Source:
(1) DC 5V /1000mA  adopter(w/o)
(2) USB 5V Cable(with) from computer.
(3) Rechargable lithium battery inside.
Tech. Info.:
(1) Output:Rms 3W(3W*1)
(2) Right/Left sound respond
 frequency:150-18000HZ
(3)Signal and noise ratiopower amplifler: ≥80dB
Function:
(1) Can link to your MP3 MP4 CD DVD iPod, computer and Cell Phone., play music
(2) Micro SD card/TF card can play music by insert straightly, support MP3 format music. With Earphone slot.                                                      (3)With strong bass.                

                                                              (4)With blue tooth

★ 输出功率：RMS 4W（2W+2W）THD=10%
★ 频率响应：150-18000HZ（+/-3dB）
★ 信噪比：≥70 dB
★ 扬声器：外径45mm,防磁4欧
★ 外置USB线
★ 音响尺寸：74.5*50*52mm
★ USB 5V供电或适配DC-5V供电，不能高于5.5v
★蓝牙音响
内置锂电池）