Knock Sensor Hit sensor module KY-031

Product description
Description:

Knock sensor module and a digital 13 interface, built-in LED build a simple circuit to produce percussion flasher. Interface comes with digital LED, will knock sensor connected digital 3 interface, when percussion sensor senses measure to percussive
Product details
Product Dimensions: 0.2 x 0.2 x 0.3 inches ; 0.16 ounces