DescribeNote: This product can only be used for 220v-240v voltage, so please do not buy this product in countries that use 110v voltage such as the United States, Canada, and Japan!Color: dark blueMaterial: Plastic + CopperApplicable voltage: 220v-240vPower: 3W/4.5w/6.5w/9w/12w/14wPlug: AU / EU / UK plug, if you need other type of plug, please leave a message when you place the order or contact us directly.Size: 3w(7.5x4.5x3.5cm)/4.5w(11x6x4.8cm)/6.5w(14x7.5x6cm)/9w(16x9x7cm)/12w(20x16.5x7cm)/14w(20x16.5x7cm);Power cord length: 73cm/110cmNumber of stomata: 1pcs/2pcs/4pcs;Trachea length: 200cmAir volume/min: 3w(3L/min), 4.5w(2*3.8L/min), 6.5w(2*4.5L/min), 9w(2*5L/min), 12w(4*3.5L/min) ),14w(4*4.5L/min);Adjustment function: Except for the 3w pump body which does not have the function of adjusting the air volume, the pumps of other powers all have the function of electronically adjusting the air volume.Note: This product does not have a charging function, once the power is cut off, it will stop working.Feature:1. Energy saving and power saving, super silent.2. Using copper as the motor material, the performance is stable.3. The inner shell + outer shell double-layer protective shell, which effectively reduces the noise and is truly silent~4. Single and double vent types can be used for medium and small fish tanks, and four vent types can be used for medium and large fish tanks.5. Four vents package, deep water 1.5m can still maintain a large air output!6. It can be used for aquarium oxygenation, seafood oxygenation, etc.7. Equipped with air stone, check valve, large air volume, stable, uniform and reliable.