1. The on-board audio power amplifier chip TDA7266, dual channel 7W + 7W, suitable for 4-8ohm 5-15W speakers 2. The main pin powered the chip, convenient control of the external device, terminal to 2 channels 5.08 (mm) 2P on board, represent the output of the left and right channel 3. The on-board dial potentiometer, can adjust the output volume 4. Support for the DC socket, terminal blocks, row needles 3 power input mode, the default is the DC plug, the working voltage: 3-18V 5. The panel size: 45 (mm) x33 (mm)