Product Detail Pulse oxygen inhalation Adopted by pulse oxygen inhalation, equipped with ultra-sensitive sensors, to ensure that release oxygen timely when you breath, so that you will feel more comfortable when you breath. Adjustable oxygen flow 1-5 level of oxygen flow to adjust High oxygen purity Oxygen purity keep 90%-96% at any level Easy to take Light weight 1.98kgs portable to carry and use Technique Parameters Product Name small portable oxygen concentrator Pulse oxygen level 1-5 level adjust Oxygen purity 90%-96% (all level) Oxygen flow 0.21-1L/min Size 206*183*86mm G.W. 1.98kg (include battery) Power 130W Charging power 100-240V Battery working time 1.5-4.3 hours Charging time 2 hours Noise 39-60dB Working puressure 86-106kpa Working altitude 0-5500m