With multiple noise reduction and large air volume design, it is stable and constant for increasing oxygen. This oxygen pump has a small size design and it is portable.There is knob for you to adjust the air volume to meet the oxygen demand of different fish. And the oxygen pump can make the water in the fish tank healthier, increase oxygen, and provide a better living environment for the fish.Made of high quality ABS material, the oxygen pump is durable, energy-saving and stable.There are different sizes of the product for choice.It is suitable for various sizes of fish tanks.Item Name: Oxygen PumpMaterial: ABSEU PLug: 220V/50HZUS Plug: 110V/60HZ(Please Do Not Use 220V Voltage)Features: Energy Saving, Stable, Plug And PlaySize Details: [Model A] Size: 12.2cm x 7.5cm x 5.4cm/4.8 x 2.95 x 2.13, Cable Length: 76cm/29.92, Power: 3W (Approx.)[Model B] Size B: 13.5cm x 8.5cm x 6.5cm/5.31 x 3.35 x 2.56, Cable Length: 76cm/29.92, Power: 3.5W (Approx.)[Model C] Size C: 17cm x 10.5cm x 7.8cm/6.69 x 4.13 x 3.07, Cable Length: 110cm/43.31, Power: 8W (Approx.)[Model D] Size D: 19.3cm x 11.5cm x 8.3cm/7.6 x 4.53 x 3.27, Cable Length: 110cm/43.31, Power: 12W (Approx.)[Model E] Size E: 23cm x 17.6cm x 9.5cm/9.06 x 6.93 x 3.74, Cable Length: 110cm/43.31, Power: 8W (Approx.)Notes:This product does not contain accessories such as oxygen hoses and air bubbles. US plug is not allowed to use up to 220V.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 Oxygen Pump