The Coralife Power Center Dual Day Night Timer allows for complete 24 hour control over lighting cycles including dawn, day, dusk, and nighttime. An excellent choice for saltwater reef lighting systems, this timer features a total of 8 outlets with three outlets dedicated to daylight control, two outlets for lunar cycle control, two outlets for control of Actinic blue lights, and one constant power outlet. Other features include: Grounded 3 prong plug with 3 foot power cord Sliding outlet safety covers protect outlets not in use UL listed