ADA Timed Aquarium Fish Food Automatic Feeder Moisture Proof Adjustable Appliance can be placed vertically or fixed on fringes of tanks, multiple use and simple operation. Can be set up to feed once or twice per day. Besides the auto function, every press of MANUAL will run the feeding once. Apply to feeding of flakes and granules, and quantities control. The product combines the functions of moisture proof and crush for foods. After twist the rotor, it will rotate and stop at the position where the feeding stops.