uxcell Aquarium Automatic Adjustable Fish Food Feeder, Black Easy to put the food in it; Food quality is adjustable Rotate the screw gear built in; With 12h and 24 hour mode Feed 12h once and 24h one set by the switch. A knob for manual feed control Product Name : Automatic Food Feeder; Use for : Fish Aquarium Power : 2 x AA Batteries(Not Included); Size : 10.5 x 7.4 x 10cm/4.1" x 2.9" x 3.9" (L*W*H)