Quantity: one set, does not include fish food The automatic aquarium feeder can establish stable and quantitative feeding, so you don't have to worry about be fed when you go out. About food quantity: The feeder can be adjusted once every 12 hours and once every 24 hours. Adjust the feeder opening depending on the type of fish food you have. It is recommended to feed fewer and more meals, and slowly. adjust the reasonable amount of feed to avoid excessive contamination of food and water quality. The output of the automatic fish feed machine is adjustable and is suitable for feeding a variety of fish feeds, such as pellet feed, pellet feed, fish feed flakes, strip foods, etc. You can choose a suitable feeding box according to the amount of food in the aquarium to avoid frequent feeding, food accumulation and humidity. This model is powered by 2 AA batteries, but the battery is not included with this product. Clip-on fish feeders are suitable for open aquariums, and fixed velcro fish feeders are suitable for closed aquariums. Retaining clips can also be used to secure water pipes. Package size: 14.5*14.5*9cm Note: The data are all manually measured, please allow 1-3cm error, due to the difference in light and display, there will be some color difference, the actual object received shall prevail.