Battery Operated: Manual or automatic operation with 2 AA batteries (Included), you don’t need to buy extra to use them immediately, which makes it easy to place anywhere without having to plug in Compact size: 11 x 7 x 7cm, feeding capacity varies with feed type such as 70-120g pellets Water resistant design moisture: Moisture-proof funnel keeps food fresh and dry, won’t get wet or get stuck Smart Program: Maximum 4 meals a day can be set and 2 servings of each meals to choose from, the aquarium food feeder meets all your fish’s food needs at all times Two Installation Methods: There are two options to install the automatic fish feeder. base or attach to the aquarium with a double-sided sticker.Make sure the feeder is mounted Ă© above the water level and that it does not fall into the water