High Power Ultra Silent Aquarium Air Pump Fish Tank High Energy Efficient Oxygen Breathe Water PumpThe product possess advanced air compressing ststem damping system and multilevel muffler which is extremely low in noise Can be free to choose the size of the oxygen pump out of gas Engergy saving design Ultra quiet Long lasting performance Suction cups to fit any aquariums ModelVoltageFrequencyWattMax OutputPlugAQ918220 240V50 60Hz2 5W3L minUS plugAQ928220 240V50 60Hz5W2 X 3L minUS plugSpecification Color BlackShell Material ABS PlasticMovement All copper movementCup and non slip base RubberSize L x W x H AQ918 110mm x 85mm x 65mmAQ928 160mm x 95mm x 80mmModel AQ918 Single hole AQ928 Double hole Package Included 1 xAquarium Air Pump Will send plug adapter according your shipping receiving country Instructions For Use 1 Connect pump to air stone of filter via air pipe 2 Plug into 220 240 volt power point 3 To prolong pump life replace air stones regularly 4 Never allow pump to come into contact with water Tips The working principle of oxygen pump is to use air vibration foam to increase the surface area of water contact with the air so that the water dissolved oxygen in the air is more to achieve the purpose of water dissolved oxygen So the oxygen and water quality also have close relations the same size of the aquarium the better water quality is more easily dissolved oxygen more making high oxygen content When using the product recommend you put the pump