How to see if the hotel has hidden cameras?

The locations where pinhole cameras are easy to hide in hotels are: TV sets, routers, small holes in set-top boxes, smoke alarms, air conditioning outlets, ceiling corners, chandeliers and other hidden places, hanging shadows, and socket switches on the walls.

Special attention should be paid to: alarm clocks, speakers, drinking fountains, air purifiers and other equipment facing the bed, as well as toiletries in bathrooms and bathrooms.

Photographers may hide waterproof cameras in large-capacity shampoo and bath bottles. If residents just squeeze the shower head, they can't find the camera. But if you shake the bottle, you can feel the camera inside.

The working principle of pinhole camera is: the light collected through the lens is projected onto the photosensitive element, which converts the light signal into an electrical signal; Converting the electric signal into a digital signal; The digital signal is compressed and transmitted to a monitor or recording device, so that it can be displayed or recorded as an image that we can see.

However, due to the limitation of volume, pinhole cameras generally cannot adjust the focal length and aperture size. If there is audio function, components for sound collection, processing and transmission should also be added.