Product Details: Sound Detection Module Condition: New To identify the presence of sound Sensitivity is adjustable Working voltage: 3.3 V to 5 V Digital switch output Fixed bolt hole, convenient installation Size: 3.2 x 1.7cm VCC external connect 3.3 V to 5 V voltage GND external connect GND OUT small plate switch output interface Color is shown as pictures PLS NOTE that due to lighting effects, monitor's brightness/ contrass settings ect, there could be some slight differences in the color tone of the pictures and the actual item!