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2. Outlawed anti-drone radio jammers are being marketed on ... - AOL

   www.aol.com/news/anti-drone-companies-market...

   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 ...

3. Security alarm - Wikipedia

   en.wikipedia.org/wiki/Security_alarm

   Some alarm systems serve a single purpose of burglary protection; combination systems provide fire and intrusion protection. Intrusion-alarm systems are combined with closed-circuit television surveillance (CCTV) systems to record intruders' activities and interface to access control systems for electrically locked doors. There are many types ...

4. Radio jamming - Wikipedia

   en.wikipedia.org/wiki/Radio_jamming

   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 ...

5. Immobiliser - Wikipedia

   en.wikipedia.org/wiki/Immobiliser

   The electric immobiliser/alarm system was invented by St. George Evans and Edward Birkenbeuel 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]

6. How to secure your home on a budget - AOL

   www.aol.com/finance/secure-home-budget-194553571...

   GRSICO Wi-Fi Alarm System. Average cost: $79.99. Rating: 4.2 stars. The GRSICO Wi-Fi Alarm System provides home security on a budget and is great for people who live in an apartment or rent a ...

7. Home security - Wikipedia

   en.wikipedia.org/wiki/Home_security

   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]