Westek LC120BC-4 Automatic Twist Lock Photo Control N/A Imported Automatically turns lights on at dusk and off at dawn Ideal for road, parking lot and driveway lighting Requires no seasonal adjustments Encapsulated photocell withstands temperatures of -50 - 150 degrees Fahrenheit Twist to install On at Dusk, Off at Dawn 3-prong twist-lock control for any outdoor mercury vapor and sodium lighting fixtures Ideal for road, parking lot and driveway lighting / Time delay feature eliminates annoying flicker Hermetically encapsulated photo cell withstands temperatures -50 to +150 F 120 Volts., 60 Cycle AC / 1000 Watts Max