1, onboard LM386 chip

2,200 times the gain circuit design

3,Onboard speaker docking station

4,Onboard 10K adjustable resistance, you can adjust the volume to enlarge

5,Onboard power indicator

6, the chip's main pin has been drawn, you can directly enter the audio signal

7, the working voltage: 5 ~ 12V

8, board size 41 (mm) x13 (mm)