Donner Aquarium Automatic Fish Food Feeder Once or Twice Daily Dry, loose flake and pellet food can be used Up to2 feeds daily, Set feeding times by pressing the switch to 12h or 24h Ideal for various sizes of aquariums with options of placing the food feeder on aquarium, free-standing or rim-mounted Inbuilt Quartz timer for accurate feeding. Can be operated automatically or manually, making fish-keeping easier Unique system to prevent food from being moisturized or clogged in dispenser