Topro Pond Tank Aquarium Automatic Fish Feeder Dispenser Timer Measurements: approx. 11cm/4.3" (H) 10cm/3.9" (L) Drum: diam. C 6.5cm/2.6"; height C 2.7cm/1.1" Power Source: 2 AA 1.5V alkaline batteries (NOT INCLUDED) Its unique swirl control is smooth and silent, no clogs & no jamming at all, regardless of fish food in pellets or flakes Package includes:1automatic fish feeder