PSE certification is a compulsory safety certification in Japan. It is used to prove that electrical and electronic products have passed the safety standards tests of the DENAN Law or international IEC standards. Japan's DENTORL Law (Electrical Device and Material Control Law) stipulates that 498 products must pass the safety certification to enter the Japanese market. Among them, 165 kinds of Class A products should obtain the diamond-shaped PSE mark, and 333 kinds of Class B products should obtain the round PSE mark. From April 1, 2001, the "Electrical Product Control Law (DENTORL)" has been officially renamed the Electrical Product Safety Law (DENAN). Unlike the control of the previous stipulations of the regulatory system, the new system will be unofficial To ensure product safety.