2 * Excluding AAA batteries, lasts up to 3 months Feed a variety of fish foods including flakes, pellets, powders and bars. Up to 4 meals per day, 1 to 2 rotations at a time. The charger also has a “manual” button. Built-in digital clock for added accuracy. Can work both automatically and manually. Fill the container with food without disassembling the automatic feeder. Programmable feeding volume and time. It can handle virtually any type of fish food (including flakes, pellets, or chunks) with no clogging, clogging, or hassle.