Unclife Air Pump Is Aimed At Oxygenating Your Aquarium Efficiently And Quietly With Its Low Power Consumption And Advanced Air Compressing System Directions For Use: 1 Cut The Tubing To The Needed Length 2 Connect It To The Pump & Air Stone 3 Plug In Notes: Ensure To Always Put The Pump Higher Than Your Tank If Not Possible, Use A Check Valve To Stop Any Water Flowing Back From The Tank To The Pump How To Make The Pump Even *More* Quiet Buy More Capacity: If You Need Quiet, Buy An Adjustable Pump At A Twice The Capacity You Need, Then Turning It Down To Half Capacity Double The Flow: You Can Increase Airflow On A Lower Setting Buy Doubling The Hose With The Included T Connector To Double Air Flow Cover It Up: Wrapcover It In Soundproofing Material (Ie A Washcloth) No Touchy: No Hard Part Of This Device Should Have Contact With Any Other Hard Item Specifications: Voltage: 110 - 120 V 50 60 Hz Exhaust: 40 Lmin (2 X 20 Lmin) Pressure: 0016 Mpa Power: 40 W Internal Diameter Of Airline: Standard 4Mm Dimensions: 5 X 28 X 25 Inches Recommended Tank Size: 60 - 400 Liters Length Of Power Supply Cable: 39 Inches 100 Cm Weight: 116 Lb Whatas In The Box 1 X Air Pump, 1 X 65 Ft Airline, 2 X Check Valve, 2 X Air Stone, 2 X Connector