3X(1, onboa TDA2030A o amplifier chip< />2, mono 18W (RL = 4 ohm) amplifier circuit < />3, onboa speaker terminal block< />4, onboa 10K adjustable resistance, you can adjust the volume of the amplification< />5, onboa indicator, the chip's main pin has been led out, you can dirly input the o signal< />< />working voltage: 6 - 12V< />size: 55 x 21 x 15mm< />Material:ABS< />colour:blue< />< />Package Conten:< />1 x TDA2030A module)