A portable audio playing device which is able to play music directly by low-power source or even without being connected to power supply such as USB. The device includes an out source DC force serially connected to a source selector with a Pre-Amp and a power system distribution and regulator. A power management block is connected between the out source DC force and the power system distribution and regulator. The power management block is connected to a battery charger, a battery cell and a DC converter charge pump which is connected to the power system distribution and regulator and the power stage or driver. The device proceeds charging steps during playing music and can also be used outdoor by gaining enough power to the source selector and the power stage or driver from the power management block.