Specification: Voltage: 110-120V60Hz Size: 77*61*22In(195*155*55Cm) Max Air Flow: 256Gph(4*4Lmin) Air Pressure: 20Kpa Product Description: 1&Nbspmore Accuracy For Adjustment] The Whisper Aerator Has High Accuracy Electric Adjustment, Easier To Get Suitable Volume, More Reliable And Less Vibration, Much Higher Reliability 2 Smaller Consumption, Larger Air Capacity] High Frequency All-Copper Pneumatic Motor, With High Efficiency Air Stone, Produce More Bubbles, Provide Enough Oxygen For Your Fish 3 Durable] There Are 4 Mental Outlets On The Fish Tank Bubbler, High Quality, Durable And Corrosion-Resistant, Can Also Reduce Noise 4 Simple Installation] This Air Pump Can Be Flat Or Suspended Installation, Come With All The Accessories Needed, Easily And Quickly To Install And Use Package Including: Air Pump*1, Instruction*1, T Connector*2, Air Filtering Cotton*2, Return Valve*4, Air Stone*4, Air Tube*4M