Onboard audio power amplifier LM386
Audio signal gain up to 200
Adjustable voltage amplitude for analog output
Signal output indicator

Specifications:
Power: 3.3V ~ 5.3V
Dimension: 39.0mm * 21.0mm
Mounting holes size: 2.0mm

Applications:
Ambient sound detection
Sound level detection

In the case of working with a MCU:
VCC ↔ 3.3V ~ 5.3V
GND ↔ power supply ground
AOUT ↔ MCU.IO (analog output)
DOUT ↔ MCU.IO (digital output)