Specification: Type: Hand Sweep and Stepless Touch Dimmer Switch Voltage: 12V -24V MAX Load: 5A 12V / 3A 24V Penetrating Wood Detection Range:;=25MM Features: 1 Smart contact dimmer control sensor switch is used behind wooden board (like kitchen cupboard ,wardrobe, closet..) or glass mirror. It can work on dc 12V led light, And it more flexible to adhere anywhere you like,simple and easy to instation. DON&;T NEED OPEN HOLE!!! 2 contact sensor can sense the medium materials: wood plate, rock plate, stone, paper, acrylic, plastic, glass, and varied non-metallic conductor supplies three distance: The diversified thickness sensitive is different, the thinner the higher Please don&;t near to metallic materials to bypass interference