How to tell the difference between a hotel smoke sensor and a camera?

The smoke detector has a red indicator light, which normally flashes every 5 seconds, so it is easy to see, but the camera does not have this indicator light for concealment.

2, the induction window is different:

Smoke detectors are generally fully enclosed, with only a square sensing window. The camera has several perspective windows, surrounded by black barbed wire, so that the camera can see the area to be monitored.

3. Different wiring:

From the wiring point of view, smoke detectors generally have four wires, and all four wires are the same. Camera wiring is two wires, a power plug and a video output plug.

4. Different identification methods:

One way is to turn off the lights, close the curtains, turn on the camera function of the smart phone, and walk around the room with the mobile phone without pressing the shutter or turning on the flash. If you find a red dot, you have a camera. If you have no red dot, you have no camera.

5. Different in nature

Smoke alarm is actually another name for smoke alarm or smoke alarm. Under normal working conditions, most brands of smoke detectors have flashing lights, which means that the controller is checking the detectors to check their working conditions. If the alarm status indicator is on all the time.

The red light of the camera is an infrared camera, which can image when the light is insufficient at night. It is similar to the infrared imager used by the military in the movie.

Baidu encyclopedia-smoke detector

Baidu encyclopedia-camera