The relationship between smart cards and power switches

The relationship between smart cards and power switches
    We all know about power access switches; they are often found in hotels or guesthouses. These switches only need to be installed on the wall and then inserted into the switch. These two products are inseparable; without a power access switch, the smart card cannot be used. Without a smart card, the power switch cannot be used either. So, how is a smart card generally used? The answer is relatively simple: after writing the data inside the smart card, Just plug it into the power switch because the switch itself also has a sensor for the smart card, which needs to match the card's data. The idea is simple: the smart card can be plugged into the switch to draw power. They have a mutually beneficial relationship.

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