UNIVERSEL: 2*AAA batteries included, can last for 3 months. Feeds all kinds of fish foods, including flakes, pellets, powders and strips. Ideal for home fish tanks and aquariums. Can feed most of pet fishes, turtles, newts and frogs. ATTENTION: Please follow instructions to set up for rotation times per turn, otherwise the feeder wont work FEEDING TIMES: Up to 4 feeding times per day 1-2 rotation per time. Easy setup just follow our manual and you will find it easy to set 4 feeding times on the machine. Choose the feeding times by yourself. Also the feeder has a button of Manual, have fun when feeding fish by yourself. INSTALL METHODS: The feeder has 2 install methods for you to choose. One is to fix the feeder to the tank wall by using the holder. Another is to paste the feeder with double-side sticker on the tank cover. Make sure the feeder can be over the water level to keep fish food dry. EASY CONTROL: By adjusting the slider, you may increase or decrease the amount of food dispensed per rotation. Easily control the amount of fish food dispensed by yourself. WHAT YOU GET: 1 x Automatic Fish Feeder 1 x User Manual 2 x AAA Batteries