Operate with Batteries: Manual or automatic operation with 2 AA batteries (Included), you don’t need to buy extra for immediate use, which makes it easy to place anywhere without having to plug it in Compact Size: 11.5 x 10.5 x 7 cm, feeding capacity varies by food type such as 65ml Moisture Resistant Design: Moisture-sealing funnel keeps food fresh and dry, won’t get wet or jam Smart Program: Maximum 4 meals per day can be set, and 2 servings of each meal can be set, the aquarium food dispenser meets all your fish’s food needs at any time. Two Installation Methods: There are two options for installing the automatic fish feeder. Mount on base or attach to aquarium with double-sided sticker. Make sure the feeder is mounted above water level and does not fall into water