3L Portable Battery Operated Oxygen Concentrators Machine products Fill the air through the

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

this means that the concentration of oxygen will be about 90% and there will be a 3% margin

Easier maintaining

RNS(repetitive nerve stimulation)

3)Oxygen Concentrator 49*49*63cm

3L Portable Battery Operated Oxygen Concentrators Machine products Fill the air through thePortable 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.