M2cbridge Aquarium Air Pump 2 Outlets 5w Voltage: 220-240v, frequency 50-60Hz, watt 5w, max output 2x4L/min Using high-tech sound technology, the average noise of pump is 29.337 db ABS engineering plastics, good sealing, reduce vibration noise produced by the machine while working All copper wire motor, power-saving, longer life, running more stable This pump can be used for, aerating single or multiple aquarium tanks, oxygenating hydroponic nutrients, oxygenating indoor ponds and water gardens