Description Large output power energy sufficient good quality can directly drive 4or 8small speakersGood noise suppression you will hear nothing from the loudspeaker if there is no audio inputYour can charge this board directly with your computer or mobile phone USBSuper mini design can be easily placed in a variety of digital productsThe whole board adopts machine welding with high quality standThe negative pole of left and right channels output end cannot connect together Specifications Unit size 1 85 x 2 11cmMaterial FR4Input Voltage 2 5 5V USB power supply is availablePackage included 20 x 3W D Type PAM8403 amplifier board