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 perfect 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: 500 x Capacitive touch switch button self-Lock module