The ETL is the brief name of the American electronics test laboratory( the Electrical Testing Laboratories).The laboratory of ETL is all establish by American inventor Edison in 1896 of, possessing the very high good reputation within the scope of the United States and worlds.Together the UL, CSA is similar, ETL can basis the UL standard or the ASCII test issue the ETL attestation marking, also can at the same time according to standard or Canadian standard test of standard of UL or ASCIIs and CSAs issue compound attestation marking." Us" of the lower right means to be applicable to the United States," c" of the lower left means to be applicable to Canada, have" us" and" c"s to then all apply at two nations at the same time. Any electricity, machine or the machine electricity product as long as take to has the marking of ETL to express that this product has already attain through the United States and the Canadian product safety standard of widespread approbation of lowest request, it matches the safe standard of related product through test;And also represent to produce the factory approval to receive the strictly periodical check, with the consistency of the assurance product quality, can sell go toward two country markets of the United States and Canada. The ETL also requests it produce the place to have already led the examination, and applicant approval henceforth as to it's the factory periodically carry on on the trail of examination, to insure the product to meet this request always. The ETL marking