ENER-J's Kinetic wireless key fob switch is portable and very easy to use. It has a built-in micro energy generator. When the switch is pressed, the kinetic system transforms the movement into energy. This transmits a signal to the receiver to turn the lamp or other load on or off. No Wiring. No Battery. Easy installation and usage. The key fob switch is portable and can be used from up to a maximum distance of 80m oudoors or 25m indoors. There is no longer a need to install back boxes, make holes or channel out for switch lines in the wall if you use the ENER-J Kinetic wireless switch. The switch is safe, convenient and extremely simple to install and use. Control Distance 25m indoor, 80m outdoor Life Time 200,000 times on/off IP55 Rated