220V转3V-12V 400MA可调电源适配器收音机复读机变压器充电器

使用方法：r r一，先检查用电器上标明的额定电压，然后拨动电压开关，使它指向用电器相符合的电压档位上。r二，检查用电器的电源极性，调到对应上的正负极。r三，选择合适的插头插进用电器电源孔。rr r'

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使用方法：r

一，先检查用电器上标明的额定电压，然后拨动电压开关，使它指向用电器相符合的电压档位上。r

二，检查用电器的电源极性，调到对应上的正负极。r

三，选择合适的插头插进用电器电源孔。r

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