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A car alarm is an electronic device installed in a vehicle in an attempt to discourage theft of the vehicle itself, its contents, or both. Car alarms work by emitting high-volume sound (often a vehicle-mounted siren, klaxon , pre-recorded verbal warning, the vehicle's own horn, or a combination of these) when the conditions necessary for ...
The electric immobiliser/alarm system was invented by St. George Evans and Edward Birkenbuel and patented in 1919. [2] They developed a 3x3 grid of double-contact switches on a panel mounted inside the car so when the ignition switch was activated, current from the battery (or magneto) went to the spark plugs allowing the engine to start, or immobilizing the vehicle and sounding the horn. [3]
A transponder system is a system which is always armed until a device, usually a small RFID transponder, enters the vehicle's transmitter radius. Since the device is carried by the driver, usually in their wallet or pocket, if the driver leaves the immediate vicinity of the vehicle, so will the transponder, causing the system to assume the vehicle has been hijacked and disable it.
This is commonly seen in department stores, where security systems at exits alert store employees of the removal of unpaid items. Older car alarms also fall into this category; newer systems also prevent the car from starting or raise an SOS alarm if ever the tracking device is detached from the car or valuable asset. The revolution of mobile ...
Independent Monitor James Ginger in his latest report said, "launching a tethering device at the moving wheels of a vehicle traveling on a roadway to halt the vehicle is a use of force."
This category is for vehicle security systems and associated technologies. Pages in category "Vehicle security systems" The following 21 pages are in this category, out of 21 total.
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