Item Type: USB Oxygen Pump Material: ABS Weight: Approx. 819g / oz Plug Specifications, Product Voltage: US Plug, 110-240V Power: 4W Exhaust Volume: 5 L/min Battery Type and Capacity: Lithium Battery x 1 (6000mAh) (Shipped with Built-in Battery ) Air Volume Adjustment: Eight-Speed Air Volume Adjustment Power-Off Self-Start: Support Vent Holes: 2 Outer Diameter of Stoma: 4MM Exhaust Pressure: 18kpa Purpose: Aquarium Aeration Pump for Fish Tank, Portable Aeration Pump for Outdoor Fishing1ABS outer cabin isolates mechanical noise, large LCD screen, easy to use, multiple noise reduction, providing comfortable sleep and rest experience. 2Precise components, stepless air volume adjustment, airtight engine room to isolate the movement noise, rubber foot pads to isolate resonance noise. 3Pure copper motor, energy-saving and long-lasting power, rechargeable lithium battery, safe and long-lasting battery life. 4One machine with two functions, not only can be used indoors, but also can be used for outdoor fishing. 5Large capacity of 6000 mAh, long battery life of 108 hours, fast charging, and oxygen at all times. 6Power failure protection, intelligent AC and DC use, self-starting after power failure. 1 x Oxygen Pump 1 x Data Line 1 x Plug