When the power is not enough, it can be added from the top, which is very convenient. Just press the top of the sliding charging cover to add. Holds most types of food, including flakes, pellets or crumbs. A manual release button provides "snacks" outside of scheduled feeding times. Adjustable clips allow the feeder to be mounted on almost any style of aquarium. Features Battery powered easy to program Easy-to-read LCD display Manual and automatic feeding Compact design for easy installation Screw feed system Keep food fresh and dispense it accurately and economically. Removable feed barrel The food container is removable, making it easy to clean and replenish food. food capacity The volume of the bottle is 200 ml. It contains enough food to retain fish fat while you are away. package 1 x Automatic Aquarium Fish Feeder