What is RoHS:
RoHS (Restriction of Hazardous Substances) is a European Directive requiring that electrical and electronic equipment sold in Europe after 2006 must comply with the strict Directive regulations limiting presence of mercury, cadmium, haxavalent chromium, polybrominated biphenyls, or lead, including lead solders to certain levels. RoHS regulations have been adopted by many countries besides EU, including China.