Custom feeding time/cycle plan: There are 4 feeding time period settings by selecting the number of revolutions of the feeding barrel. You can choose (feed every 8/12/24/48 hours) and press it. Two ways to fix: place the feeder on the aquarium, vertical or edge mount. Fasten 0 to 33 mm/1.3" thick fuel tank glass to the surface of the tank, or to the surface of the tank, using a double-sided sticker of tape and adjustable clips. This automatic fish feeder is fixed and can be rotated, so it can be rotated 360 to the position you want. Instant Feeding Button: Just press the "Manual" button for instant feeding and press the button to feed the fish at any time. The automatic fish feeder is super quiet and won't scare the fish. The hatch food door adjusts to the amount of food you need to dispense. Long-term large-capacity feeding: 200ml/6.7 tons; the automatic fish feeder is powered by two AA batteries (not included), which can be used for several months, without worrying about feeding fish in the aquarium or fish tank on weekends or holidays. This automatic fish feeder sets the feeding time and feeding method, and can feed the fish well even on long-term business trips. Suitable for food and fish tanks: Suitable for most types of fish food such as dry, loose flakes and granules, flakes, granules, powders and bars. Perfect for aquariums and fish tanks of all sizes. Not only for goldfish, but also for feeding most pet fish, turtles, salamanders and frogs. Custom feeding time/cycle plan: There are 4 feeding time period settings by selecting the number of revolutions of the feeding barrel. You can choose (feed every 8/12/24/48 hours) and press it. Two ways to fix: place the feeder on the aquarium, vertical or edge mount. Fasten 0 to 33 mm/1.3" thick fuel tank glass to the surface of the tank, or to the surface of the tank, using a double-sided sticker of tape and adjustable clips. This automatic fish feeder is fixed and can be rotated, so it can be rotated 360 to the position you want.