Hidden camera or spy camera or security camera.
A hidden camera or spy camera or security camera is a still or video camera used to record people without their knowledge. The camera is "hidden" because it is either not visible to the subject being filmed, or is disguised as another object. Hidden cameras can be built into commonly used objects such as television sets, smoke detectors, clock radios, motion detectors, ball caps, plants, and mobile phones. Hidden cameras may be used for household surveillance and may also be used commercially or industrially as security cameras. The proliferation and lower costs of video recording devices has led to an increase in the use of hidden cameras for legitimate surveillance need, as well as for entertainment and other purposes.
Nanny cam, Hidden cameras may be installed within common household objects to monitor and record the activities of caregivers. These are commonly referred to as "nanny cams." The legality of using hidden cameras is usually a subject of controversy. For example, a case involving a nanny that was allegedly caught violently shaking a baby was thrown out as worthless evidence (but due to issues regarding video quality,