The compact EHEIM Everyday Fish Feeder automatic feeding unit is operated by batteries (included). The actively aerated feeding chamber dispenses dry food down to the last flake. With simple-to-use programming, you decide when the fish should be fed. Double dosage of the food is also provided in the programming. “Snacks between meals” are possible at the press of a button at any time. A warning system informs you of low battery power. Approximate capacity: 100 mL. An integrated fan and ventilation system eliminates condensation accumulation and keeps the food dry.