Product: Name:Microphone Sensor Module, It’s to be used for detecting the sound intensity of ambient. PCB Size : 32x 17mm/1.25x0.66in(LxW) Specification: Operating voltage 3.3V-5V, Adjustable sensitivity (adjusted by the blue digital potentiometers), Output form: Digital switching outputs ( 0 and 1 high and low Level) Wiring Instructions: VCC external 3.3V-5V voltage (can be directly connected to 5V microcontroller and 3.3V microcontroller), GND External GND, OUT small board switch output interface (0 and 1) Note for use: This sensor can only identify the presence or absence of sound (according to the vibration principle), but cannot identify the size of the sound or the sound of a specific frequency Package includes: You will get 5 x Microphone Sensor Module(Blue), 1 x 15Pin Female to Male Dupont Cable