Eheim "Feed-Air" Digital Aquarium Fish Feeder. Electronically controlled programmable feeder allows for up to four daily feeding times. Has choice of short or longer feeding intervals due to time delayed double programming function. Has LCD display with clock. Feed level can be seen at once through the transparent container. Ideal for flakes and granules. Manual release button allows for feeding outside of pre-programmed times. Fits on the aquarium cover. Uses two "AA" batteries (included).