Feature: 1. The 2.5W air pump is very energyefficient, with a stream rate of 2L / min, which is very suitable for small fish tanks. 2. It adopts advanced air compression system and shock absorption system, multistage silencer design, and extremely low noise. 3. The air pump has an excellent structure and low power consumption, which can quietly increase the oxygen content of the fish tank. 4. The rubber feets are designed to be nonslip and prevent vibration, helping to reduce possible noise. 5. Made of highquality materials, with good impact resistance and abrasion resistance, making it durable. Specification: Item Type: Oxygen PumpMaterial: PlasticCable Length: Approx. 93cm / 36.6in with Plug ( There is an Error of 0.51.5cm / 0.2 0.6in )Maximum Pressure: 0.018 x 2mpa Air Output: 2 x 2L / min . Package List: 1 x 9002 Double Hole ( Bare Pump ) Note: 1. The air pump must be placed higher than the fish tank, if it is lower than the fish tank, a oneway guide valve needs to be installed. 2. This product cannot be immersed in water. It is recommended to put a soft pad under the product to reduce noise and vibration.3. Frequent cleaning and replacement of air pipes and air stones can obtain the maximum air stream and extend the life of the air pump.4. When the voltage is too low to work normally, the current voltage should be adjusted to the rated voltage so that the product can be used normally.