Features: 100% Brand new and high quality Signal output indication Single channel signal output The output effective signal is low level When there is soundoutput low level and the signal lights Can be used for Acoustic control light; give sound and light alarm working with Photosensitive sensor Specifications: Size: approx. 32mm*17mm*15mm(length*width*height) Main Chip: LM393 Electret condenser microphone Working Voltage: DC 4-6V Color: Blue Net Weight: 3g Note: The Maximum induction distance is 0.5M Package Includes: 1 x Sensitivity Control Potentiometer Sound Detection Sensor Module