Fangrui Product Details The Module Is Based On A Touch-sensing Ic Ttp223 Capacitive Touch Switch Module. Trigger Setting Mode:(1- Greater Than Short;0- Greater Than No Short) Power Supply: 2.5v-5.5v/2w Use Effect: Ab = 00: No Lock High Ttl Level Output; Ab = 01: Self-locking High Ttl Level Output; Ab = 10: No Lock Low Ttl Level Output; Ab = 11: Self-locking Low Ttl Level Output Touch Key Switch Module Stable Touching Detection Of Human Body For Replacing Traditional Direct Switch Key. A Very Useful Addition For Projects Or Applications Where A Conventional Mechanical Button Or Switch Is Not A Choice. The Touch Button Capacitive Switches Module Can Be Installed In Plastic, Glass Surface Non-metallic Materials. As Long As The Touch Of The Correct Position, You Can Make Hidden In The Wall, Desk And Other Places. Color:red Material:pcb Size:15 X 11mm Package Contents: 100 X Capacitive Touch Switch Button Self-lock Module Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different