... Freq Range:200Hz-16 KHzPower Source:USBBattery Voltage:3.7VBattery Capacity:550 mAhDistortion :< 0.5%Charge ... personalized. 6.With Built-in high capacity rechargeable lithium-lon battery and USB charging connection, you can ... use it more portable along with computer, cell phone, PSP, MID, MP3, MP4, and MP5 ... hundred thousand times test on the speaker’s button to guarantee a good quality. 8.Spiral ...