This is a digital microphone for use with the various Arduino boards. It has a digital output and is based on the LM386 amplifier for which there are extensive tutorials on-line. The sensor has 3 connections GND, Vcc, and Out. It will work on either the 3.3v or 5v outputs from the Arduino with the same level of sensitivity. If the microphone picks up and sound signals it will send a digital signal to one of the Arduino's digital pins.
Dimensions: Depth 36mm, Height 20mm, Width 19mm, Weight 4.0g