The TORK ZTL124 turn-lock advanced LED photocontrol light sensor provides a simple way to control residential or commercial exterior lights and appliances based on the ambient light level. Features include the zero-cross switching technology, enhanced surge protection, silicone sensor designed for human eye response and the coated, weather-resistant circuit board. Designed for applications including LED, CFL, Induction, HPS and HID lighting fixtures in roadways, parking lots, and security or flood lights.