... layers of metal protective layer. That can prevent the electricity leakage on the heater caused by breakdown of PTC ... with multi voltage.contact informationCompany name: Shenzhen TianChengQianHai Tech Development Co., LtdAddress: Room 201, Block A, No. 1, ... Kong currency Zone, Shenzhen (Located at Shenzhen Qianhai Commerce Secretariat Co., Ltd.)DongGuan office: Room502, Hongji, Plaza, No. 15 Dezhen ...