Something is flashing on the roof of the hotel. Is it a camera? How to see if there is a camera in the room?

When traveling and staying outside, everyone should pay attention to personal property and privacy. It is best to choose a regular hotel brand when staying in a hotel. If you are not at ease after staying in the hotel, you can also check whether there is a camera according to the online method. However, it should be noted that there will be lights on the roof of the hotel. It's actually a smoke detector, not a camera.

This is not a camera. This thing is called a smoke detector. This is a fire extinguishing device. You can feel the concentration of smoke in the air. When a fire breaks out, it is usually accompanied by light, heat and smoke. At the beginning of the fire, due to the low temperature of combustion products and smoldering state, a lot of smoke will be produced. When the smoke enters the smoke detector, it will be detected by the smoke detector and its concentration will be analyzed. When the concentration exceeds the set value, it will trigger a fire alarm. Cameras are usually installed in very hidden places, such as under the TV. We just need to keep the room dark, turn on the flashlight and check whether there are abnormal reflection points around the room.

1. If it is a smoke detector, it works normally and flashes every 5 to 10 second. But the camera doesn't have this function and won't flash all the time.

2. Look at its appearance carefully, and you will find a difference. Smoke detectors are usually fully enclosed with only one square sensing window. However, there is a perspective window surrounded by black lines around the camera, mainly for the convenience of monitoring.

3. Compared with the internal power cord, you will find that smoke detectors generally have four wires, which are almost the same. But the camera has only two wires, one is the power cord and the other is the video output plug.

4. The detector has indicator lights (one or two, green and red, always on or flashing. The smoke camera has no indicator light. It has a big black screen window.

You can turn off all the lights in the room and close the curtains first, so that the room is in a dark state without light. Turn on the camera of the mobile phone, and then check whether there are bright lights in the hidden place. Generally, there is a little red dot in the room, equipped with monitoring equipment. Pay special attention to check the dead corners where pinhole cameras may be installed in rooms, ceilings, televisions and air conditioners. If there is a pinhole camera, you will see a red dot on your mobile phone.

Pinhole cameras mainly rely on infrared rays to shoot images at night, but there are few mobile phones that filter infrared rays on the market, so it is impossible to check them. You can turn off the main power supply of the room before going to bed to avoid taking pictures. Then there are furniture, switches, chandeliers, sockets, ceilings, even tissue boxes, vases and other places where pinhole cameras are easy to hide. You can search one by one.