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  2. Home security - Wikipedia

    en.wikipedia.org/wiki/Home_security

    Some forecasts project the home security market as a whole will be worth $47 billion by 2020, [12] with the DIY home security market worth $1.5 billion. [13] While the market for home security is expanding, especially with cable TV and Internet service providers introducing their own security and home automation products, it is a fragmented ...

  3. ADT Inc. - Wikipedia

    en.wikipedia.org/wiki/ADT_Inc.

    ADT Inc., formerly The ADT Corporation, is an American security company that provides residential and small business electronic security, fire protection, and other related alarm monitoring services throughout the United States.

  4. Security alarm - Wikipedia

    en.wikipedia.org/wiki/Security_alarm

    The technology typically found in motion sensors to trigger an alarm includes infrared, ultrasonic, vibration and contact. Dual technology sensors combine two or more forms of detection in order to reduce false alarms as each method has its advantages and disadvantages. Traditionally motion sensors are an integral part of a home security system.

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  6. Closed-circuit television - Wikipedia

    en.wikipedia.org/wiki/Closed-circuit_television

    Video surveillance has been common in the United States since the 1990s; for example, one manufacturer reported net earnings of $120 million in 1995. [103] With lower cost and easier installation, sales of home security cameras increased in the early 21st century.

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