This multi-voltage 120-240 Volt, 1800-Watt programmable Twist-Lock Photocell automatically turns lights On at Dusk and Off after pre-set time (6pm-3am), then On again at pre-set time (5 am - 8 am) and then Off at Dawn. With a built-in Astronomical clock you only ever have to set it once and it automatically adjusts to the Daylight Savings for your time-zone. And if the power ever goes out it saves your settings, however it takes 24-hours for it to reset itself. State-of-the-art technology measures length of night and lets you set "off" time
