How to get to the hotel to see if there is monitoring?

You can test it with a mobile phone camera. Test method:

1.

When staying in a hotel, turn off all the lights and close the curtains, preferably without any lights.

2.

Turn on the camera of the mobile phone, turn off the flash, hold the mobile phone around the room 360 degrees, and let the mobile phone shoot every corner. If there is a red dot, it may be the camera. Test principle:

3.

Infrared camera refers to a camera with infrared rays, which acts as a light source at night. Even in dark conditions, the camera can still shoot.