1, onboard TDA2030A audio power amplifier chip 2, mono 18W (RL = 4 ohm) power amplifier circuit design 3, onboard speaker terminal block 4, onboard 10K adjustable resistance, you can adjust the volume of the amplification 5, onboard power indicator, the chip's main pin has been led out, you can directly input the audio signal working voltage: 6 - 12V size: 55 x 21 x 15mm Material:ABS colour:blue Package Contents: 1 x TDA2030A module Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. 1, onboard TDA2030A audio power amplifier chip 2, mono 18W (RL = 4 ohm) power amplifier circuit design 3, onboard speaker terminal block 4, onboard 10K adjustable resistance, you can adjust the volume of the amplification 5, onboard power indicator, the chip's main pin has been led out, you can directly input the audio signal