Click here to view more NT-01 and NT-02 feature comparison Features: This PORTABLE OXYGEN CONCENTRATOR provides an adjustable oxygen pulse flow of 5 Liters per minute and supplies a highly efficient oxygen concentration of 93%±3%. This OXYGEN MACHINE is relatively compact and ideal for everyday use at home, outside, or in the car, and it is effective in any setting.  The 5 liter protable oxygen concentrator is small in size and light in weight, it is the most lightweight and delicate machine in the 5 Liters machine with the same effect, and weighs only 6.5 pounds, so it will not be a burden for you to go out. Due to its compact size, you can even go mountain climbing with it. Additionally, this oxygen concentrator includes a backpack that can be worn cross-body or over both shoulders. This oxygen breathing machine is capable of meeting all of your outdoor needs. The PORTABLE OXYGEN MACHINE is easy to operate with a large touch screen, and there is a button “Grade” on the large operation panel, and this button could adjust the output of oxygen flow based on your needs. Besides, the portable oxygen is equipped with an Alarm light to warn you of the abnormal status. For your safety, our BEST OXYGEN CONCENTRATOR could detect the signal of respiratory when you are using the oxygen machine, and the oxygen availability of portable concentrators would be raised to a level corresponding to your needs. This PORTABLE O2 CONCENTRATOR is equipped with a single battery, which is a battery-embedded design. This battery is capable of powering the oxygen generator for up to three hours. Compared with other oxygen generators in the market, it is equivalent to an upgrade product. Most of the HIGHT-FLOW OXYGEN CONCENTRATORS in the market are separated from the battery and the machine. The device is a brand new version of the OXYGEN SUPPLY MACHINE. Specifications: Product Name  VARON Oxygen Concentrator NT-01 Size 7.09"*4.92"*10.63" (L*W*H) Inches Weight 6.5lb Power supply DC 12～16.8V; AC100～240V; 50/60Hz Input Power 75W Oxygen flow 1-5L/min adjustable Oxygen concentration 93%±3% Battery capacity 92Wh/6.4Ah Oxygen mode Pulse Noise ≤58dB(A) Normal working environment Normal working conditions Ambient temperature range:50F-95F Relative humidity range: 30%-75% Atmospheric pressure range:860hPa-1060hPa Storage & Transportation environment Ambient temperature range:-20℃~60℃ Relative humidity range: 10%-93% Atmospheric pressure range:700hPa-1060hPa NT-01 Components: 1X AC/DC Adapter1X Portable oxygen concentrator1X Instruction manual (Check the online manual here)1X Carrying bag1X Tube & nasal cannula1X Battery Tips: Our portable NT-01 & NT-03 are Belong to Pulse flow oxygen Concnetrator. Pulse flow oxygen is based on your breathing rate, and focuses on the amount and intensity of each breath you take. Pulse technology detects when you are about to inhale and delivers a bolus (pulse dosage) of oxygen at the start of your breath.