3L Portable Battery Operated Oxygen Concentrators Machine products Oxygen concentration: 30%±2%

Oxygen concentration: 30%±2%

Ramp Item: 0-60min adjustable 1min/Step

Fill the air through the upper valve and open the lower valve to deflate

Oxygen purity to 29(+1/-2)%

RNS(repetitive nerve stimulation)

3L Portable Battery Operated Oxygen Concentrators Machine products Oxygen concentration: 30%±2%Portable Oxygen Machine Features: Multi purpose: Awesome for home, car, travel, work, Including battery. Charge 4 hours, Work Time for 2. 5 hours. If need much more time, pls click HERE Low noise: less than 45dB, night use will not affect sleep, It works with or without water, no need to refill at night. It is a good backup for your home OC, 30% purity oxygens not adjustable. Not for medical use, couldn't work 24 7 Portable and light: Size: 9*4. 3*6.