Leviton WSCPC-W LevNet RF Self-Powered Light Sensor Daylight Harvesting light sensor has both switched and dimmed capabilities, both are dependent on the application and receivers used Zero power consumption when enough natural light is available, solar power provides the energy to keep the device ON while sensor technology turns the lights OFF, eliminating additional expenses to the end user's energy bill Zero external power required with No wiring required limitations, this enables the installer to place the sensor in the optimal location of any application to capture optimal daylight readings Exclusive -inch battery-less-inch technology significantly reduces callbacks and maintenance for additional savings. Solar panel provides power for the device to maintain a sufficient charge to operate for long periods of time without light.