Supports manual feeding with one button or automatic feeding (4 groups adjustable), manual feeding does not affect the preset timer. Easy to set the timer via the control buttons. Equipped with a 200 ml large capacity cereal storage for different needs, it can hold grains, large grains, slices, strips and more shapes of fish food. Digital screen for easy reading, clearly shows the current time, feeding quantity (circles) and battery level. Powered by 2 AA batteries (not included), low power consumption. The feed output quantity can be adjusted manually, semi-transparent design for easy and convenient monitoring of fish food. Easy installation with the adjustable and 360 degree rotating clamp in the house, aquarium, etc., suitable for open aquariums whose glass thickness is within 24mm. The automatic fish feeder makes it convenient to release food for the aquarium when you are busy with work, travelling or other place. Equipped with a 200 ml cereal storage for different requirements, the feed output quantity is also adjustable. With control buttons and digital display for easy adjustment and reading. Features: Digital screen for easy reading, clearly shows current time, feeding quantity (circles) and battery level. Powered by 2 AA batteries (not included), low power consumption. The feed output quantity can be manually adjusted, semi-transparent design for easy and convenient monitoring of fish food. Easy installation with the adjustable and 360 degree rotating clamp in the house, aquarium, etc., suitable for open aquariums whose glass thickness is within 24 mm. Note:Size and color may be slightly different due to manual measurement and different light environment. Thank you for your understanding. Specifications: Color: black + red Material: plastic Screen: digital display Time setting: 4 groups Feeding quantity (circles): adjustable Feeding mode: manual/automatic Capacity: 200 ml Clamp thickness: 24 mm. Power supply: 2 x 1.5V AA battery (not included) Item Size: 14.5 * 11 * 7 cm / 5.71 * 4.33 * 2.76 inches Package size: 15.5 * 12 * 8 cm / 6.10 * 4.72 * 3.15 inches Package Weight: 350g / 12.35oz Package contents: 1 x automatic feeder for aquariums.