1、cumulative time function；
2、Exceed press safety valve helping safe ensure.
3、Install power cut warning function.
4、high pressure and low-pressure alarming function
5、（7F-5 Double flux) shunt design, two users are provided with oxygen at the same time.
6、（7F-5W with nebulizer function）provides atomization function, maximum nebulizing rate≥0.2mL/min
7、（7F-5 with cord controller）oxygen concentrator and oxygen intake device can be separated, to realize the remote control and use