... , but also easy to carry.It has built-in rechargeable lithium battery,a power management and battery protection cirecuit,and can ... ) High sound quality,high power output 4) Build-in rechargeable lithium batteries 5) Stereo and bass 6) Integrated power supply and audio ... , but also easy to carry.It has built-in rechargeable lithium battery,a power management and battery protection cirecuit,and can ...