You can recognize the of ambient noise, but this sensor can detect only the presence or absence of sound (based on vibration principle) not the size of the sound or certain sound frequencies A fixed bolt hole is designed for easy installation.Features- Color: Shown in the pictures.- Material: Electric components.- Size: Approx. 3.4 * 1.6 * 1cm (L*W*H).- Sensitivity adjustable (shown in blue digital potentiometer setting).- Operating voltage 3.3V-5V.- Output of the form of digital switching output (0 and 1 high-low).- A fixed bolt hole for easy installation.Module connection manual1.VCC external 3.3 V-5V voltage (which can be connected directly with 5V and 3.3V MCU MCU).2. GND external GND.3.OUT change small disks Output interfaces (0 and 1).Three instructions1. The sound module is generally used to detect the of ambient sound.2. If environmental sound does not reach the set threshold, the module OUT output is high, if the external environmental sound exceeds a set threshold, the module OUT is low.3. Small on-board digital output OUT can be directly connected to the microcontroller through the microcontroller, to detect high and low, making sound environment detection.