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If it is a women's toilet, it is generally under the urinal partition door, or in front of the urinal, and the direction of the probe is generally a private part, so the distance is not too far, generally within a radius of about 1 meter of the urinal, and the black smooth material is carefully inspected before taking off the pants. There is also a special machine to prevent candid photography, so that the "pinhole visual scanner" can detect the radio waves of various candid cameras and give alarms, which is not high-tech, but the price is not cheap.
Girls take selfies and laugh sweetly, boys pose for photos look cool, what do you think?
In the field of cameras, there are different functions and styles for different occasions, and you are talking about this because the hotel corridor is relatively dim, so it needs infrared laser function, and the restaurant does not need to use it under the effect of lighting!
Not necessarily.
I often see some burglaries on TV, hotels, etc., and the police lock up the suspects through night surveillance. >>>More
In a corner outside the exhibition area, there is a clear hint.