The automatic fish feeder can be filled with most spirulina flake, pellet or stick food. Fully waterproof, the feeder easily mounts on the pond edge. Works well in large aquariums too. The maximum number of meals dispensed by the fish feeder will normally range from about 40 for a small pond or aquarium to 8 for a large pond. An adjustable quartz timer allows for regulation of feeding times and indicator shows when battery condition is low. Batteries included.