Varon NT-05 takes user-friendliness and convenience to a whole new level, offering an unmatched level of ease and practicality. This portable oxygen machine, weighing only 3.3lb and equipped with a convenient carrying bag, is specifically designed to meet oxygen needs in various outdoor scenarios. Whether you are taking a walk in the park, traveling in an RV, hiking, or shopping, this compact device can provide you with the oxygen support you need. Product Specification: Oxygen Flow 3L/min Oxygen Concentration 30%±2.5% Oxygen Mode Continuous Item Weight 3.3 lb Item Size 9.25*3.94*5.55 (L*W*H) Inches Noise Below 52 dba Input Voltage AC10-240V 50/60Hz DC12-16.8V Power Consumption 25W Battery Pack Capacity 2500mah 14.8V, max voltage 16.8V Battery Lasting Last 2 hours, rechargeable battery Four Levels of Timing 20/40/60/120 minutes In the Package: VARON Portable Oxygen Concentrator NT-05 Carrying Bag Nasal Oxygen Tube Rechargeable Battery DC Power Cable User Manual **DOES NOT INCLUDE THE AC ADAPTER** Replacement 16.8 volt adapter available on Amazon $25-$35