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From the past to today, a considerable number of hidden camera crimes are taking place in Asia. Anyone, man or woman, can be a victim, so people cannot use public facilities at ease. If you put a red cellophane on the back of the camera and use a flashlight to illuminate the suspicious area, you can know the location of the camera, but it is difficult to carry cellophane at all times and is easy to lose. So, if you change direction of 'Exposure',you can detect the surroundings at any time. When not in use, it does not affect the camera.
Gyeongsan-si, South Korea