What is the square box inserted by the hotel customer service?

A square box inserted by the hotel customer service is where the room card is inserted.

Because every hotel has a way to insert a room card, this position accounts for all the electricity in the room. If you don't plug it in, there will be no electricity, so a square box inserted by the hotel customer service is the place where the room card is inserted.

Hotels, also known as hotels, inns, inns, guest houses, business trips, inns and inns, are places where guests sleep and eat. Specifically, hotels sell rooms.