Sensing distance 5.0cm/1.97inch. The brightness can be adjusted. Switches turn ON/Close when hands or other objects pass over the Sensors within its working distance. Suitable for LED Lighting such as LED strips, module, under cabinets and other LED accent light. Full protections housing. Builted-in protections includes short circuits, over loading, over current, over temperature. You can switches on/close your electrical appliances in house by simply hand-waving, not need to push or touch any button.