The Eheim Twin Feeder isa brand new fish feeder: Twin stands for two food chambers (2 x 80cm cubed) which can feed your fish with different types of food - flakes, granules, sticks, and pellets. The 2 chambers can be independantly controlled so that 2 types of food can be used for feeding at different intervals. Programmable automatic fish feeder with greater feeding options. Twin chambers hold two different types of fish foods. Easy way to provide a varied and nutritional diet for aquarium fish Intelligent, automatic fish feeder increases feeding options. Programmable feeder provides the best nutrition for your tropical aquarium fish by dispensing a varied diet. Twin chambers hold different types of fish foods including flakes, granules, sticks, or pellets. Accommodate various feeding levels (surface, mid-water, and bottom) by using sinking pellets, floating fish food, or slow-sinking granules. The two chambers can be controlled independently for custom feedings intervals. Uses 4 AA batteries. Features: Large display - all settings are visible Permanent display of time Permanent display of the feed setting Up to 3 feed times in 24 hours Up to 9 turns per feed time Random feed time available Diet Function - skips one day every 7 days Battery life display (low battery)