Uniclife Aquarium Air Pump, up to 20-Gallon,Silent Fish Tank Oxygen Pump With Air Stone And Silicone Tube, White, Square Perfect for small size and medium betta tank or nano aquariums up to 20 inch deep, Tank Capacity: 20 Gallon Air Flow: 0.6L /min, Pressure: 0.011 Mpa, Power: 2 Watt Ultra Quiet -Less than 38dB Compact design and lightweight, Weight: 2oz High-efficiency, long operating life, Low power consumption, stable performance