The Hydor battery operated fish feeder features one touch operation that makes automatic fish feeding simple and easy. The takes 2 AA batteries, not included, and includes a low battery indicator feature. There are three settings for once, twice, or three times a day feeding. The food container is adjustable to release the desired amount at feeding time. It features an airline input for the use of an optional air pump to ventilate the food to prevent clumping. The timer starts when the batteries are installed. Two year manufacturer`s warranty.