Thank you for your professional customer service, very satisfied ~ You're welcome. Has your company is the authorized agent Wei Kang? I want to buy a licensed .. Yes, the current home in Shanghai, the only authorized distributor of portable ventilator. Have any questions you can call 021-63542833 consultation. How can we effectively identify new machines and used machines? How to distinguish mainstream and parallel imports? Please visit the website or call the State Food and Drug Administration. Enter Product Name check your hands, "device type." Respironics ventilator to provide product "serial number" security certification service, the fuselage can check whether the serial number on the back of original New.