Microphone Sound Sensor Voice Detection Module Operating Voltage: DC 3.3V-5.5V PCB Size: 31 x 17 mm (L * W) Fixed Hole Diameter: 3 mm * Instant purchase welcome, silent purchase at midnight OK ◎ * Follow-up discount available * Bulk purchase welcome, feel free to comment * Free shipping! ・Please understand and purchase due to home storage and simple packaging for shipping (*´-`) ・In order to sell at a slightly lower price, we may ship after taking it out of the box due to shipping costs. Excellent sensor for Arduino projects. Enjoy electronics and programming. Description The sound detector is based on a microphone and a power amplifier. It outputs a signal when the sound intensity exceeds a certain threshold. This sound sensor cannot detect sound levels. "OUT" outputs a digital signal of 0 and 1. Sensitivity can be adjusted by adjusting the potentiometer. Wiring instructions: VCC ---- "+" GND --- "-" OUT ---- Digital output uxcell Microphone Sound Sensor Voice Detection Module with Digital Output for Arduino Projects, 5 pieces Also on sale! #Rika's product list is here 1-52.01208.0966