1、[2 Installation Modes] Auto fish feeder can be clamped on the wall of the fish tank or placed flat. There are 2 installation modes, and there are more choices for different fish tanks. 2、[Excellent Silent Effect] Fish automatic feeder has an excellent silent effect, even if it is placed in the bedroom, it will not be very noisy, and you can enjoy high quality sleep. 3、[Timed Feeding] Automatically feed the fish at regular intervals, or you can press the "manual" button to start feeding immediately, so you don't have to worry about the fish not being fed when you're not at home. 4、[200ml Large Storage Space] Convenient aquarium tank timer fish feeder has 200ml large storage space, no need to add food frequently, feeding is more worry free. 5、[Large Diameter Opening Design] Fish tank automatic feeder large diameter opening design can store a variety of different feeds, suitable for different types of fish. Item Type: Auto Fish Feeder Material: ABS Size: Approx. 17x12x(8+7.5) cm / 6.7x4.7x(3.1+3) in Application: Fish Tank Automatic Feeder Battery Type, Quantity: 2 x AA Dry Batteries (not included) Button Function Description: Manual: Manual Feeding Mode, Press the Manual Button Once, the Barrel Rotates Once 12h/24h: Automatic Feeding Mode (12h/24h) 1 x Auto Fish Feeder (Battery Not Included) 1 x Flat Card 1 x Fixing Screw 1 x Feeding Port 1 x Manual