Features: 1. Mini shape,space-saving for your aquarium. 2.Can fill the container with food without disassembling the automatic feeder. 3. Programmable food volumes and feeding times. 4.By adujusting the slider,you may increase or decrease the amount of food dispensed per rotation. 5.Has a built in digital clock for accuracy. 6.A clear easy-to-read LCD screen which shows all info at a glance. 7. Safe and convenient.Simple operation and installation. 8. Can work both automatically and manually. Modle Battery Type Battery Daily Feeding Times Capacity Size Container Size AF-2003 2xAA Batteries not included 1-2 times 65ml 10x7.3x11cm 6.5x2.7cm AF-2005D 2xAA Batteries not included 1-4 times 100ml 10x7.3x11cm 7.7x4.2cm AF-2009D 2xAAA Batteries not included 1-4times 65ml 11.5x7x10cm 5.7x3.5cm Notice: Batteries are not included. includes:1x Automatic Fish Feeder