Efficient super mini digital amplifier， to obtain input 5V 6W of power， special internal output processing circuit for maximum power output at a lower voltage， super power， built-in standby electronic switch， built-in high-gain buffer amplifier， built-in short circuit protection. 3.6 to 6V， single-cell lithium battery or USB -powered appropriate， also be four 1.5V batteries， power transformers to add fixed 5V regulator circuit chip will burn more than 6V. Take the USB 5V power supply is recommended to use a single lithium or electricity. Slim board can be very easy to put into a small plastic box or other device in the slot， such as to create MP3 / 4 or small laptop external speakers， as you imagine.