How can I find out if there is a surveillance camera installed in the hotel?

Method 1: Turn off all the lights, close the curtains, turn on the camera of the mobile phone and look at every corner with the camera. If there is a flashing red dot, it means there is an infrared signal, so it may be a camera.

Method 2: Put your finger vertically on the mirror. If there is a gap in the middle, it is a normal mirror. If there is no gap, be careful whether it is a mirror that penetrates one side.