Smart Aquarium Fish Feeder, Holiday Aquarium Tank Timer Feeder, Programmable Fish Food Dispenser (Blue)WORRY-FREE FEEDING - You can go away knowing your fish are being fed properly fed and cared for. EASY TO INSTALL AND PROGRAM - Easy start guide is included, detailed installation instructions, can be simply set to feed once or twice a day. CHANGEABLE FEEDING CHAMBER - 2 sizes of feeding chambers are included, a small one (80ml) for those with a relatively small aquarium and ensures the food always stays fresh, and a larger one (200ml) for those with a large stock or if you plan to expand your aquarium in the future, you won’t need to buy another feeder. ADJUSTABLE VOLUME CONTROL - Delivers the right amount of food, ensures your po fish are properly fed BATTERY LIFE - powered by two AA batteries (not included) and can be used for months. Smart Aquarium Fish Feeder, Holiday Aquarium Tank Timer Feeder, Programmable Fish Food Dispenser (Blue)