Marineland Natural Wave Pump Timer is an economical way to create natural wave motion in your reef aquarium. Timer will control three outlets with adjustable frequency - can change the duration from 20 seconds to 3 minutes. 3 standard outlets for lights and heaters. Electrical rating: 15 amps at 125 volts, 60 HZ and 100 watts maximum per outlet. Great for all saltwater and freshwater aquariums.