Century 7 Day Heavy Duty Digital Programmable Timer - Dual Outlets can control your system every day, every several days, or several times per day! The timer allows up to 8 on/off times per day, a one (1) minute minimum "on" time, and different settings for different days. The timer is a great way to keep everything on track and promote the healthy growth of your plants and flowers. It's three prong grounded, has an LCD digital display for easy operation, includes a battery backup, and has a dual outlet feature so you don't lose a plug. These timers are great for lights or hydroponic systems. Using timers to automate your hydroponic garden adds convenience and encourages productive growth of your plant. Timers allow you to provide a consistent light, nutrient, and airflow program for your garden. The battery backup assures you stay on schedule even after a power outage. If you have any question, please contact us: Centurytimers@gmail.com