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Wireless security cameras function best when there is a clear line of sight between the camera(s) and the receiver. If digital wireless cameras are outdoors and have a clear line of sight, they typically have a range between 250 and 450 feet. If located indoors, the range can be limited to 100 to 150 feet.
Fake security cameras (or dummy cameras, simulated cameras, decoy cameras) are non-functional surveillance cameras designed to fool intruders, or anyone who it is supposedly watching. [1] Those cameras are intentionally placed in a noticeable place, so passing people notice them and believe the area to be monitored by CCTV. [citation needed]
A dummy load is a device used to simulate an electrical load, usually for testing purposes. In radio a dummy antenna is connected to the output of a radio transmitter and electrically simulates an antenna , to allow the transmitter to be adjusted and tested without radiating radio waves .
M42 thread mount cameras first became well known under the Praktica brand, and thus the M42 mount is known as the Praktica thread mount. [1] Since there were no proprietary elements to the M42 mount, many other manufacturers used it; this has led to it being called the Universal thread mount or Universal screw mount by many.
Conceptual through-beam system to detect unauthorized access to a secure door. If the beam is interrupted, the detector triggers an alarm. A photoelectric sensor is a device used to determine the distance, absence, or presence of an object by using a light transmitter, often infrared, and a photoelectric receiver.
The Jeep did not realistically simulate the noise or movement of a tank, but allowed the dummy to be deployed quickly. [7] Meanwhile, the reverse was also done, to make tanks look like trucks. A further device was put into use that both created simulated tank tracks and erased real ones. [8] An inflatable dummy tank, modeled after the M4 Sherman
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