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Internationally, household appliances are divided into three categories: Class 1: Electrical appliances are electrical appliances with only one layer of insulation. Such electrical appliances must be equipped with leakage protectors and grounding protection (那是, three-pin plugs are required). Such as air conditioners, machine tools, motors, ETC. 類型 2: Electrical appliances have double-layer insulation measures, and leakage protectors are required, and grounding protection is not required (那是, two-pin plugs can be used). Such as TV, electric fan, table lamp, induction cooker, electric ceramic stove, ETC. Class 3: Electrical appliances are electrical appliances that use a safe voltage. 一般來說 12 - 36V electrical appliances, such as mobile phones, 筆記型電腦, ETC.