60 mL Capacity: Measuring 3" L x 3.9" W x 4.5" H, this timer fish feeder fits perfectly in 5-20 gallon fish tanks. 60 mL capacity offers ample food storage to keep your fish fed during your short-term absences ? no more worry about starvation of fish Automatic Fish Feeder: Featuring a timed feeding function for up to 2 feedings per day, this practical aquarium fish feeder can automatically feed your fish every 12 hours or 24 hours. You can also press the manual feeding button to release food anytime Battery Powered: Driven by two 1.5 V AA batteries (Not Included), the adjustable fish food dispenser features a long working time of about 3 to 4 months. Really energy-saving and reliable for long-term use Suitable Food Types: This auto fish feeder for fish tank is only suitable for holding Pellets, Granules and Strips. Easy to refill the food container by just removing the transparent cover when the food is used up. Only fit for dry fish food with diameter under 3 mm Adjustable Feeding Amount: Simply move the slider left and right to adjust the food outlet size (6 gears available). Then test the most suitable feeding amount with the manual feeding button before using the feeder Product description