In simple terms, the toothbrush and the cup constitute a double transformer, one part of the transformer is located in the cup, the other part is in the toothbrush,(there is a metal coil in the glass) to achieve inductive charging.
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A total of 2 charging modes, the toothbrush itself does not have a charging port, the first charging must be placed in the charging cup inside the charging cup there is a base and then connected to a power cord? It tells you that you can brush your teeth and rinse your mouth while warning you that the cup must be fully dry before charging and stressing that the base should not touch water.