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Tags can be equipped with a built-in alarm which sounds when the tag detects tampering or unauthorized removal from the store. The tag not only triggers the store's electronic article surveillance system, [10] but also sounds an alarm attached to the merchandise. The local alarm continues to sound for several minutes after leaving the store ...
The potential market for anti-drone systems such as radio frequency jammers includes large corporations and organizations that are worried about drone terrorism but are not legally allowed to use ...
Stationary jammers are more expensive and powerful. They usually have a larger jamming radius and wider frequency band. Strong jammers can require additional cooling as they can overheat. Stationary jammers usually have a range of 100 meters and require a power supply of 230 V. Self-made jammers are low-power devices that work over short ranges ...
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]
Anti-theft systems protect valuables such as vehicles and personal property like wallets, phones, and jewelry. [1] [2] [3] They are also used in retail settings to protect merchandise in the form of security tags and labels. [4] Anti-theft systems include devices such as locks and keys, RFID tags, and GPS locators.
Door and window sensors are also implemented in most home security systems. One part of the system is installed on the door or window itself while the other part is installed on the frame of the door or window. The two part system connects securely when a door or window is closed, creating a security circuit. [5]