Product description
2,200 Times Gain Circuitry Design
3. on-Board Speaker Wire Holder
4. on-Board 10K Adjustable Resistor, Which Can Adjust the Amplified Volume
5. on-Board Power Indicator Light
6. the Main Pin of the Chip Has Been Led out, and the Audio Signal Can Be Directly Input.
7. Working Voltage: 5~12V
8. Board Size 41(mm) X13 (mm)