Why do you have to knock on the mirror after staying in a hotel?

Nowadays, many people stay in hotels when they go out to play or go on business trips, so various express hotels have developed rapidly, but not every hotel is so safe and hygienic, especially female friends who live alone. This small method of knocking on the mirror after staying in the hotel can help you check whether the hotel is safe!

So why knock on the mirror? Mirrors were originally used when dressing up, but now many people have misunderstood the mirrors in the bar. Mirrors are no longer just tools for people to dress up and decorate their rooms. Because, hotels, hotels and other places have appeared double-sided mirror sneak shots!

Double mirrors were originally used as indoor French windows or glass curtain walls to protect privacy, but they were used by criminals.

So how can we tell if a mirror is a double mirror?

Put your finger on the mirror and observe the distance between your finger and the mirror. If there is a distance between your fingertips and the image in the mirror, it is a one-sided mirror. If there is no gap between your fingertips and the image in the mirror, it is a double mirror. Be careful!

For a woman who lives alone in a hotel, try this little method. I also remind everyone here that you must choose a regular hotel when you go out, and don't be greedy and cheap!