Our auto fish feeder can be operated automatically or manually, making fish-keeping easier. It is great to feed your fish at a scheduled 4 sets of time per day, or immediately initiate a feeding by pressing hand-shapedbutton.Large capacity: 200ml/6.7ounce; Powered by 2 x AA batteries (not Included), 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.Works with most types of fish food, such as dry, loose flake and particle feed, flakes, pellets, powders and small strips. Ideal for various sizes of aquariums, fish tanks. Not only for goldfish, it also can be used to feed most of pet fishes, turtles, newts and frogs.The unique 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.Place the food feeder on aquarium, rim-mounted. It is easy to fix it on the tank glass with the thickness ranging from 0 to 33 mm/1.3 inch by adjustable clamp base .