Feeding your aquarium fish is made easy with this Automatic Feeder. Over half of all aquarium water problems and fish health problems are caused by over feeding. With an automatic feeder the correct food is delivered each day without any over feeding or forgetting to feed. With its simple design the feeder is capable of delivering a measured feed every 12 hours or every 24 hours. The size of the feed amount can be adjusted by way of the dial on the side of the unit. The unit is compact and has a see through food dispenser so you can see when it needs refilling. The dispenser is easily detached for easy filling. Designed to use dried foods such as flakes and pellets etc. Features; Feeds once every 12 or 24 hours. See through dispenser. Large dispenser capacity. Battery operated. Will fit Aquariums from 2 mm thick to 25 mm thick glass.