Work 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 Size Compact: 11 x 7 x 7cm, feeding capacity varies by feed type such as 70-120g pellets Moisture Resistant Design: Moisture-sealing funnel keeps food fresh and dry, won't get wet or get stuck Smart Program: Maximum 4 meals per day can be set, and 2 servings of each meal can be set, the aquarium food feeder 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 the water level and does not fall into the water Note: the data is all manual measurement, please allow 1 - 3cm error, due to the light and display difference, there will be some color difference, depending on the physical object received.