Be those who because design,shun electric equipment product is undesirable, the harm that causes the person that use (for example: Jiao order song is tranquil ＜ of leech of black Ba wholesale ? , produce notarial unit to undertake examining to the safe standard of the product so. At present more general by attestation install compasses UL(United States is made) , TUV(Germany is made) , CSA(Canada is made) etc