Powerful One Outlet: Oxygen pump power 3.5Watts, maximum airflow 55GPH, pressure 0.022Mpa.The stainless steel air outlet makes the air bubbles more uniform, the air volume is stronger, and the oxygen increase volume is larger. Adjustable Flow Rate: Designed with an adjusting knob, easy to adjust the airflow according to your fish tank or pond size and the bubble size you desire. Perfect to be used for all types of tanks with a capacity of 3-55 Gal. Double sound insulation design: Maximum 20 dB, the aquarium air pump takes double soundproofing, the 4 non-slip rubber feet on the bottom also reduce noise and prevent it from slipping. Reliable Performance: Made of high-quality ABS plastic, All-copper motor design more durable. Low energy consumption under 7/24 hours. Wide Compatibility& Warranty: KEDSUM’s quietest aerator air pump fits both fresh and saltwater tanks. Any questions about your KEDSUM fish tank air pump, please come back to us and we will be responsible for the aquarium air