... nitrogen in air 2.get pure oxygen for medical use,home care,beauty Features:Apply zeolite molecular sieve as shift, adopt advanced physical theory ... bad substance in air, so as to get pure oxygen for medical use, home care, and beauty.Technical Data:1. Flow ... Time: 30minutesPictuture: 7F-5/ 7F-8/7F-10 Oxygen Concentrator for medical use