1.We are theonly one in china to adopt molecular sieve protector,which has been patented. 2.We are the only one to set four-grade filters in this line. 3.The oxygen purity exceeds 93%. 4.There are liquid crystal displayer, trouble displayer and accumulative time displayer. 5.It adopts new type admission passage, which spirally denitrogens so that the machine can work in low noise. The mesh enclosure of air inlet adopts drawer type design, which can be taken apart and cleaned easily. 6.It is equipped with special remote controller for the wrinkly & elderly and the person whose movement is costive. 7.It applies for home,hospital,clinic,nursing home and mountain sentry. 8.1 set packed in a carton. 9.T/T and L/C are ok. 10.We will deliver the goods in 10-15 working days after recieving your payments. 11.The MOQ is 1 unit. 12.Warranty:1 year. Please do not hesitate to contact with me anything about the oxygen concentrator ,i will give you the best service.