Specifications: It adopts high-tech micro DC motor, with advanced micro computer design, which has high-strength engineering plastic shell combination, safe and reliable. You can choose 12 hours or 24 hours timing to turn on it according to your needs, and the micro motor drives the barrel to rotate, and the fish feed is automatically put in. Time-saving, it can help you a lot when there is no one at home and when you are out on business, which let you easily raise fish. With a humanized design, the mouth of the barrel will automatically return to the upward state after each turning over to prevent the fish from getting wet. There are multiple installation methods, which is also applicable to finished cylinders. Type: Aquarium Food Feeder Material: PC Power Supply: 2 x AA Batteries (Not Included) Features: Portable, Digital, Automatic, Battery Powered Size: 16cm x 8cm x 8cm/6.3" x 3.15" x 3.15" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Aquarium Food Feeder 1 x User Manual