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QUESTION: CAN U USE IT WITH OR WITHOUT THE HUMIDIFICATION CUP ATTACHED ? TY DEBBY ANSWER: It can be used either ways. For more discussions, options and details about the product, or to order the product, please click here This is one of the most frequently used oxygen concentrator with pressure-compensated flow meter maintaining the correct flow. It features light weight and compact for easy transport. It has flame-retardant cabinet for safety. Pressure-relief valve and thermal protection on the compressor. Filtration for longer bed life and better oxygen purity. Increased flow rates, decreased operating temperatures and longer life with less cup seal wear. Double-insulated unit; two-prong plug. Humidifier port helps prevent humidifier bottle and connection breakage. The opening is wide to make it easy to connect tubing or humidifiers. High / low pressure alarms and power failure alarm. Long cannula while maintaining an accurate flow setting (maximum 50 feet). Audible and Visual sensing device for low pressure, power fail and power on. Warranty: 10 years - compressor; 3 years - other materials and workmanship. For end users: Physician's prescription needed for product shipping. Dimensions: 28"h x 16"w x 14"d Weight: 52 lbs. Delivery Rate: 1/2 - 5 Liters (1/2 Liter Increments) Oxygen %: 93%@1-5 liters (+/- 3%) Electric Requirement: 115V, 60Hz Power Consumption: 400 watts average