You are purchasing a high quality compact air pump which is suitable for use in any Freshwater or Marine aquariums. Designed to oxygenate your aquarium efficiently and quietly with its low power consumption and advanced air compressing system.<br><br> The Pump Set comes with a 3.2 ft airline tubing, 1 air stone, 1 return valve and 2 connectors. <br><br> <b>ABOUT QUIET. LET US FACE THE TRUTH. </b><br> We have tested UL25 air pump to work on lowest flow rate, it sounds 25 dB, which sounds like <b>Rusting Leaves, Ticking Watch. </b> <br> On highest flow rate, it sounds 45 dB, which sounds like<b> Quiet Whisper at 2 ft., Park. </b> <br> <b>This model has an adjustable valve </b>- means you can adjust the air flow rate. <br> <b>Sitting on a folded cloth to make it quieter. </b> <br><br> <b>Specifications: </b> <br> Recommended Tank Size: 10 to 30 Gallons<br> Voltage: 110~120 V; 50/60 Hz. <br> Exhaust: 2 L/min<br> Pressure: 0.016 Mpa<br> Power: 2.5 W<br> Internal diameter of Airline: standard 4 mm<br> Length of the power supply cable: 6 Feet<br> Dimensions: 4.5 x 2.7 x 2.3 inch <br> Weight: 1 pound<br><br> <b>HOW TO SET UP: </b><br><br> Cut the tubing to the required length. Connect the tubing to the pump and your air stone. Plug in. Simple. <br> Just ensure to set the pump higher than the tank. If not possible, use a check valve to stop any water flowing back from the tank to the pump!