Great for up to 5 - 30 gallons small size fish tank, suitable for any Freshwater or Marine aquariums Adjustable flow rate with Single outlet up to 30 GPH. Compact size: 4.5 x 2.7 x 2.3 inch. Ultra-quiet, Minimum 25 dB (sounds like fallen leaves, ticking watch) in lowest flow rate. A Whole Air Pump Set Comes with everything you need. Accessories Include: 1 x Return Valve, 1 x Air Stone, 1 M Air tube and 2 Connectors. Efficient: Easy-to-use and low power consumption, Pressure: 0.016 MPa, Power: 2.5 W.