Hanging Type External Oxygen Pump Water Filter for Aquarium Fish Tank Description: This eternal filter features effective filter material hat removes harmful impurities and other contaminants for your aquarium. It works outside of your fish tank, greatly reducing the resonance and ensuring that the filter does not create too much noise during working. You can adjust the flow by the flow adjustable switch on the filter according to your need. Features: Energy-saving motor: the motor uses seamless machine core, hydrodynamic design, energy saving more than 50%. Replaceable filter material: the filter plate and the filter cotton can be removed directly after a period of time for cleaning, as well as replaced by other filtering materials. Suitable for both freshwater and marine fish tank, improving oxygen dissolving. Adjustable flow value to adjust flow and dissolved oxygen for your pet growing. Suitable for water-circulation, biochemical water filtering and adding oxygen into the water in aquarium.   Specifications: Condition: Material: Acrylic Color: Shown as pictures Power: 3W Flow Rate: 250L/H Filter Size: Approx. 7 * 8 * 10cm / 2.7 * 3.1 * 3.9inch Total Height: Approx. 19.5cm / 7.7inch Package Weight: Approx. 247g Line length: Approx. 1.1m/43.3in Package Included: 1 * Aquarium External Filter Note: 1. The first time you use it, be sure to fill the filter box up with water. The deeper the suction pipe is, the better and then connect the power. In case of power failure, fill the filter box up with water after the power is back on, then you can continue e it. If the filter box is not filled up with water, it will also have noise. It must be filled up with water when it is used. 2. Please allow 1-2 cm error due to manual measurement and make sure you do not mind before ordering. 3. Please understand that colors may exist chromatic aberration as the different placement of pictures.