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  2. Do Ring video doorbells work without a subscription? - AOL

    www.aol.com/news/ring-video-doorbells-without...

    Owned by Amazon, Ring is best known for its video doorbells, but also produces a range of indoor and outdoor security cameras, along with intercoms and even entire security systems, complete with ...

  3. Ring (company) - Wikipedia

    en.wikipedia.org/wiki/Ring_(company)

    A second-generation model, Ring Doorbell 2, was released in 2017, with updated hardware and a 1080p camera with improved low-light performance, that does not rely solely on Wi-Fi, unlike the original model. [44] The Ring Doorbell Pro interoperates with Amazon Alexa to play prerecorded greetings to visitors and allow visitors to leave a message ...

  4. Smart doorbell - Wikipedia

    en.wikipedia.org/wiki/Smart_doorbell

    It activates when the visitor presses the button of the doorbell, or alternatively, when the doorbell senses a visitor with its built-in motion sensors. The smart doorbell lets the home owner use a smartphone app to watch and talk with the visitor by using the doorbell's built-in high-definition infrared camera and microphone.

  5. New ADT Pulse® Motion Detection Offers Greater Home ... - AOL

    www.aol.com/news/2013-06-18-new-adt-pulse-motion...

    BOCA RATON, Fla.--(BUSINESS WIRE)-- Today, ADT is introducing new video motion sensor technology to provide ADT Pulse customers with an extra layer of security protection and the ultimate ...

  6. I Tried the Ring Pro 2 Video Doorbell—Here’s My Honest Review

    www.aol.com/lifestyle/tried-ring-pro-2-video...

    A clear, reliable, and easy-to-use video doorbell is a significant improvement from the old push-button standby. We tried the Ring Video Doorbell Pro 2 to see if it's worth your time and money.

  7. Motion detector - Wikipedia

    en.wikipedia.org/wiki/Motion_detector

    A motion detector attached to an outdoor, automatic light. A motion detector is an electrical device that utilizes a sensor to detect nearby motion (motion detection).Such a device is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area.

  8. 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. The corporate head office is located in Boca Raton, Florida. [5]

  9. Variable reluctance sensor - Wikipedia

    en.wikipedia.org/wiki/Variable_reluctance_sensor

    The toothed reluctor ring on an ABS-sensor To measure angular position or rotational speed of a shaft, a toothed ring made of ferrous material can be attached to the shaft. As the teeth of the rotating wheel (or other target features) pass by the face of the magnet, the amount of magnetic flux passing through the magnet and consequently the ...