Perman New Ultra Silent High Out Energy Efficient Aquarium Fish Tank Oxygen Air Pump Hot Material: Plastic. High output, Ultra quiet, Energy efficient, Durable. Voltage :220-240V. Frequency: 50/60Hz. Cord Length: 80cm. Color: White + Black + Blue Power: 1.5W. Out of gas: 1.2L / min. Pressure: 0.012Mpa. Dimension: 11*7.5*6.5mm. Power: 2W. Out of gas: 2.0L/min. Pressure: 0.012Mpa. Dimension: 11.5cm*7.8cm*7.5cm. Power: 3W. Out of gas: 2.2L / min x2. Dimension: 9cmx7cmx13cm. Power: 4W. Out of gas: 2.6L / min x2. Pressure: 0.020Mpa x2. Dimension: 10.5cmx7.5cmx14.5cm.