Battery Operated: Manual or automatic operation with 2 AA batteries (not included), you don't need to buy extra ones to use it immediately, which makes it easy to place anywhere without plugging in Moisture-proof Design: Moisture-proof funnel keeps food fresh and dry, won't get wet or stuck Intelligent Program: Maximum 4 meals per day can be set and 2 portions of each meal to choose from, the aquarium food dispenser meets all your fish's dietary needs at any time Two Installation Methods: There are two options to install the automatic fish feeder. Mount on the base or attach to the aquarium with a double-sided sticker. Make sure the feeder is mounted above the water level and does not fall into the water Number of pieces delivered: 1 Color: Black Size: 11.5*10.5*7 cm luckymeet