Sound Sensor module for Arduino and DIY projects Sound Sensor module for Arduino and DIY projectsOperating Voltage: 3.3V to 5V DC.LM393 comparator with threshold preset.PCB Size: 3.4cm * 1.6cm.Induction distance: 0.5 Meter.Operating current: 4~5 mA.Microphone Sensitivity (1kHz): 52 to 48 dB.