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Suitable for audio signal amplification of electret microphones, for small audio amplifiers. LM386 amplifier chip, the magnification can be adjusted between 20x and 200x using the adjustable resistor on the board, it can be directly. Operating voltage is DC 4V to 12V with a PCB size of 20 mm x 20 mm and a height of 7 mm. Provides power and signal amplification for clearer microphone output. Product include a total of 4pcs DC 5V-12V headphone amplifier board, which can completely meet your daily use needs and replacement.