The G.A.S Interval Timer can be used with a pump to deliver small, regular feeds, helping to maximise growth and push your plants to deliver the best possible yield. It features a light sensor and will only operate if light is detected, automating the feeding process whilst still allowing a high level of control. Determine the length of feed from 5 seconds to 10 minutes and set frequency of repetition from 1 hour to 11 hours.