digitsea 115 Volt 15 Amp 7 Day Digital Program Outlet Grow Light Timer 1.Equipped with a Built in Battery as a back up, assures you stay on schedule even after a power outage. 2. Consistent light nutrient and airflow program for your garden Encourages productive growth of your plant Three prong grounded. 3.Automating your lighting adds convenience and encourages productive growth with consistenthrs of light. 4.Timers are also essential for all hydroponic system applications. 5. Up to 8 different On-Off settings per day, Easily Programmable.