Rainbow Lifegard Fish Feeder w/Hopper. **** PRODUCT MANUAL **** Excellent for vacations and for freeing you from the chore of daily aquarium feeding! Dispenses flakes, pellets, or dry medications 1-4 times per day. Runs on a quiet, reliable, electric motor, so there are no batteries to replace, and the screw-mounts (adjustable to 3/4") attach quickly to standard tanks. Hopper included.