Our timer feeder can be operated automatically or manually, equipped with two bases, suitable for various types of fish tanks/ biorb, It is great to feed your fish at a scheduled time (once or twice or three times per day). The size of the food container is 15*5*11CM,about 0.8L .Works with most types of fish food, such as dry, loose flake and particle feed, flakes, pellets, powders and small strips. Not only for goldfish, it also can be used to feed most of pet fishes, turtles, newts and frogs. Powered by 2 x AA batteries(no cluding battery), Super energy saving, built-in large-capacity lithium battery can last for 2 months. This auto fish feeder is great for daily use whether you are at home or away. No more worry about fish feeding even you are on a business trip. Place the food feeder on the aquarium, vertical or edge installation. Use tape double-sided stickers and use adjustable clamp base to fix the oil tank glass with thickness from 0 to 33 mm/1.3 inch on the surface of the tank, or fix it on the surface of the tank. This automatic fish feeder can be rotated after being fixed, so it can be turned 360° to the position you want. The unique closed design and structure of the feed opening on the top to prevent food from being moisturized or clogged in dispenser, as well as it is convenient to add feed without removing the feeding bin. You can easily control the amount of fish food dispensed by adjusting the slider.