Check the listing for details. New Aquarium Fish Tank Mini Waterfall Hang On External Oxygen Pump Water Filter. Condition: New. Listed at 8.79 USD. Features: More Oxygen: Professional for mini and round aquarium fish tank, waterfall filter hang-on design with a high-performance biochemical cotton filter will create more oxygen for your cute fish and offers you long-lasting use. Adjustable Water Flow: Built-in regulating valve, you can adjust the water flow easily according to the size of your fish tank and your fish needs, quite easy and practical. Ultra-Quiet Working: When working, this hang-on filter will not produce noise louder than 35dB, which is super quiet and will not disturb or frighten your fish. Energy-Saving & Eco-Friendly: Only 3W power, this mini filter will not consume large electricity, saving your money. Please fill the filter with water when used for the first time. Specifications: Plug: U.S. Plug Voltage: AC110V/AC220-240V, 50/60Hz Power: 3W Max Water Flow: 250L/h Cable Length: about 1.2m/ 3.9ft Product Size: about 8 x 7x 11cm/ 3.1 x 2.8 x 4.3in Notes: Please allow a slight dimension difference due to different manual measurements. Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Package Contents: 1 x Sponge Filter 1 x Extension Tube 1 x Filter Tube