The Uniclife air pump is designed to oxygenate your aquarium efficiently and quietly with its low power consumption and advanced air compressing system. You are purchasing a high quality air pump suitable for use with any Freshwater and Marine aquariums.<br> <br> The pump comes with 2 air stones, 2 return valves and 2 connectors. This model has an adjustable valve - meaning you can adjust the air flow rate.<br> <br> <b>ABOUT SUPER QUIET.LET US FACE THE TRUTH.</b><br> <br> WE have test Uniclife air pump to work on lowest flow rate, it sound 25 dB, which sound like Rusting Leaves, Ticking Watch.<br> Then we test it to work on highest flow rate, it sound 43db, which sound like <b>Quiet Whisper at 2 ft., Park. </b><br> <b>Sitting on a folded cloth to make it quieter.</b><br> <br> <b>Specification:</b><br> Recommended Tank Size: 60 to 400 liter<br> Voltage: 110~120V 50/60Hz.<br> Exhaust: 4.0 L/min. 2.0L/min X 2<br> Pressure: 0.016Mpa.<br> Power: 4.0W.<br> Dimensions: 5.1" X 2.8"X 2.5".<br> Internal diameter of Airline: standard 4mm <br> Length of the power supply cable: 6 ft / 1.8m<br> <br> <b>Package Includes: </b><br> 1 x Air Pump<br> 2 x Return Valve<br> 2 x Air Stone<br> 1 x 6.5 ft Airline<br> 2 x Connector<br> <br> <b>HOW TO SET UP:</b><br> Cut the tubing to the required length. Connect the tubing to the pump and your air stone. Plug in. Simple.<br> We just ensure that the pump is never lower than the tank. If that is not possible, fit a check valve to stop any water flowing back from the tank into the pump!