The Aqualight Digital Power Center is a 24 hour day to night timing device that can be used with any of the Aqualight lighting systems, as well as other lighting fixtures. You can set it to turn on and off up to 7 times a day and on different days of the week. Features 4 constant power outlets and 4 alternating timer controlled outlets (2 day and 2 night). Other features include: 3 foot heavy duty power cord, sliding outlet safety covers, 3 prong grounded plug and outlets.