With Palm company engineers and factory efforts and cooperation, we finally get the NRTL certificate for North America issued by TUV, this certificate is same authority as UL, CSA, ETL and have the authorization to sell in North American countries. It means Our production is monitored by TUV. It certify and guarantee again for our excellent quality. Certificate can be check through our certificate number U8 12 03 76109 005 at TUV website: http://www.tuvamerica.com/tools/clientlists/certs.cfm . Please remember there is space between the numbers. Just copy and paste our certificate number.