Suitable for most food types including flakes, pellets or crumbs. Adjustable clamp allows feeder to be mounted in almost any style aquarium. Power can be added without disassembly, which is convenient and quick. 2 modes, manual + automatic, simple operation. < p>Two 5-section dry cell batteries, the battery lasts for three to six months (not included), Super mute, day and night do not affect sleep.