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1. Onboard LM386 Chip.
2. On-board speaker wire holder
3. On-board 10K variable resistor, you can adjust the Amplification volume.
4. Onboard power indicator,the main feet of the chip has been leaded, can input audio signal directly .
5. Operating voltage: 5 ~ 12V
6. Size 41 (mm) x13 (mm)
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