This is the ultimate timer/power strip for creating perfect day-night cycles for your aquatic life. Featuring 8 outlets, 4 constant and 4 alternating timer-controlled, you can set this unit to turn your lighting systems on or off seven times per day, and on different days of the week. The 4 timer-controlled outlets are divided into 2 daytime, and 2 nighttime, making the transition between lighting cycles simpler and easier to manage. This power strip is UL listed, with a master on/off switch and sliding outlet safety covers, creating the ideal power center for your lighting system.