The Aqualight Digital Power Center is a 24-hour day-night alternating timer device that is ideal for all Aqualight lighting systems. The unit can be set to turn on/off 7 times per day at different days of the week. The Aqualight Digital Power Center has 4 constant -power outlets and 4 alternating timer- controlled outlets (2 daytime and 2 nighttime) to make the day and night lighting applications easier to manage. The digital feature allows the alternating timer to set the day-night cycle at different times of the day at different days of the week. When the 2 daytime timer-controlled outlets are on, the 2 nighttime timer-controlled outlets are off. Product Information: -Outlet Timer/Power Strip 4 timer-controlled outlets time cycle settings Alternates daytime and nighttime outlets Can be set to turn on/off 7 times per day at different days of the week 4 constant-power outlets Master on/off control switch 3-foot heavy-duty power cord Sliding outlet safety covers 3-prong grounded plug and outlet.