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Hidden cameras in hotels and rental homes,beware: what you need to know. Russian company Kaspersky, specialized in security, has recently disclosed some tricks that can be used in order to be able to discover, you can check it here. All you have to do is turn off all the lights in the room or in the apartment room and close the windows, so as to remain in the dark. Turn on the flashlight of your smartphone and turn on the camera together with the camera to see if there is a hidden camera.