Why do some tour guides "advise" tourists to turn on their mobile phones before turning on the lights when traveling in hotels?

It is inevitable to stay overnight when traveling. In recent years, several hotels have been exposed to pinholes and invisible cameras. When traveling and staying, the tour guide "persuaded" tourists to turn on their mobile phones before turning on the lights, which actually gave everyone a trick to find these hidden cameras.

It is difficult to find a pinhole camera installed in the room by naked eye observation, but it is relatively easy to check whether a pinhole camera is installed in your room with the help of a mobile phone.

When checking, keep the room completely dark and without lights, then turn on the camera function of the mobile phone, walk around the room, check every corner of the room, and pay close attention to TV, air conditioner and other places where pinhole cameras may be hidden. If a pinhole camera is installed in the room, a little red dot will be seen on the screen of the mobile phone, which is the location of the camera.

The principle of this method is because most cameras have IR fill lights, which are called infrared rays, which are used for "lighting" when shooting at night. In order to facilitate shooting at night, the camera of the mobile phone will be equipped with IR fill light mode. Because it can be filled with infrared light, it can also identify the infrared light source, so it can identify the weak infrared light of the pinhole camera.

Tv sets, switches, charging heads, beverage cans, tissue boxes, routers, sockets, hooks, smoke alarms, shower gel in the bathroom, hair dryers and electric toothbrushes are all things that can easily be disguised as ordinary items by installing pinhole cameras, so it is important to check in the hotel. At the same time, the room card should be inserted first when checking, and many pinhole cameras are powered on after being inserted into the room card.

In order to prevent your privacy from being peeped, you must listen to the "persuasion" of the tour guide when staying out, and use the camera function of the mobile phone to carefully check the room.