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  2. Invisible Fence Inc. - Wikipedia

    en.wikipedia.org/wiki/Invisible_Fence_Inc.

    Invisible Fence Inc. (commonly referred to as Invisible Fence Brand) is a company that designs radio pet fences for cats and dogs. Manufactured and distributed by Radio System Corporation, the company sells wireless and fenceless systems that were first introduced in 1973. [ 1 ]

  3. Pet fence - Wikipedia

    en.wikipedia.org/wiki/Pet_fence

    A pet fence or radio fence, is an electronic system designed to keep a pet or other domestic animal within a set of predefined boundaries without the use of a physical barrier. A mild electric shock is delivered by an electronic collar if its warning sound is ignored. The system was first invented and patented by Richard Peck in 1973. [1]

  4. Amateur radio repeater - Wikipedia

    en.wikipedia.org/wiki/Amateur_radio_repeater

    An amateur radio repeater system consisting of a 70 cm repeater and a 2-meter digipeater and iGate. Coaxial cavity RF filter at 2 meter repeater An amateur radio repeater is an electronic device that receives a weak or low-level amateur radio signal and retransmits it at a higher level or higher power, so that the signal can cover longer ...

  5. Radio repeater - Wikipedia

    en.wikipedia.org/wiki/Radio_repeater

    A radio repeater is a combination of a radio receiver and a radio transmitter that receives a signal and retransmits it, so that two-way radio signals can cover longer distances. A repeater sited at a high elevation can allow two mobile stations, otherwise out of line-of-sight propagation range of each other, to communicate. [1]

  6. Electric fence - Wikipedia

    en.wikipedia.org/wiki/Electric_fence

    Charger for a plus-minus net fence. An electric fence is a barrier that uses electric shocks to deter humans and other animals [note 1] from crossing a boundary. The voltage of the shocks may cause discomfort or death. Most electric fences are used for agricultural purposes and other non-human animal control.

  7. Security alarm - Wikipedia

    en.wikipedia.org/wiki/Security_alarm

    A wireless system can be moved to a new property easily. An important wireless connection for security is between the control panel and the monitoring station. Wireless monitoring of the alarm system protects against a burglar cutting cables or from failures of an internet provider. This setup is commonly referred to as fully wireless.

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