How about check card?

Hotel room cards are mainly divided into two types: induction and card insertion. You can find the corresponding room according to the number on the room card first. If it is inductive, we can put the room card in the electromagnetic induction area under the door, hear a light sound, and then turn the handle to open the door; If it is plug-in type, we insert the room card chip upward into the card slot of the door, and when the green light of the door is on, we can pull out the room card and open the door.

Precautions:

Usually the back of the hotel room card will indicate how to use it. After you get the room card, you can open the door according to the instructions on the room card. If we accidentally leave our room card in the room, we can find the hotel customer service staff and ask them to help us verify our identity and open the door. For example, we can verify our identity by showing our hotel reservation order and ID card.