The module is based on -sensing IC TTP223 capacitive touch switch module. Trigger setting mode:(1- Short;0- No Short) Power supply: 2.5v-5.5v/2W Use effect: = 00: no lock high TTL level output; = 01: - high TTL level output; = 10: no lock low TTL level output; = 11: - low TTL level output Touch key switch module stable touching detection of human body for replacing 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 position, you can make in the wall, desk and other . color:Red Material:PCB size:15 x 11mm Package Contents: 100 x Capacitive touch switch button -Lock module Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.