Description: 1. Onboard LM386 Chip2. 200 multiplier benefits circuit design3. on-board speaker wiring Block4. on-board 10K variable resistor, you can adjust the volume of the enlarged5. Onboard power indicator6. the chip pin leads, can be directly input audio signal7. Operating voltage: 5 ~ 12V8. board size 41 (mm) x13 (mm)