Feature: 1. This module uses professional microphone amplifier IC, which possess high sensitivity 2. Sound sensor module have small volume and low output noise, the fixed gain is 20dB, support 3.3v and 5v 3. Low power consumption of sensor is easy to control, more stable and more efficient 4. Microphone sound sensor module possess small size, more stable performance and simpler installation 5. The sound sensor is suitable for assembly, and installed on various small equipment like microphone and robot Specification: Item Type: Sound Sensor Module Do: When the sound intensity reaches a certain threshold, output high and low level signals. (threshold sensitivity can be adjusted by potentiometer) 1. There are approx. 3mm / 0.1in mounting screw holes 2. Use 5V DC power supply 3. With analog output 4. Threshold flip level output 5. High sensitivity microphone 6. With power indicator 7. The comparator output has indicator lights. Package List: 5 x Sound Sensor Module