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Yuwell 7F-5 Oxygen ConcentratorStable Medical Grade1、cumulative time function；2、Exceed press safety valve helping safe ensure.3、Install power cut warning function.4、high pressure and low pressure alarming function5、（7F-5 Double flux) shunt design, two users are provided with oxygen at the same time.6、（7F-5W with nebulizer function）provides atomizat..