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✅ Get a three-piece deal of the AZ-Delivery KY-004 3 Pin Button Key Switch Sensor Module. ✅ 3 pin button key switch sensor module. When the button is pressed, two signal outputs are short-circuited together. ✅ Rating: 50mA 12VDC ✅ Insulation Resistance: 100MΩ.(minDC 250V) ✅ This product includes an E-Book that provides useful information on how to begin your project, it helps with a quick setup and saves time on the configuration process. We provide an array of application examples, full installation guides and libraries.