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2. Door phone - Wikipedia

   en.wikipedia.org/wiki/Door_phone

   Outdoor phone plate at the building's entrance Outdoor phone plate with camera at video door phone. A door phone or door bell phone is a set of electrical and electronic elements used to handle communication between a resident in a house, apartment or villa and a guest outside.

3. Wireless security camera - Wikipedia

   en.wikipedia.org/wiki/Wireless_security_camera

   Wireless security cameras function best when there is a clear line of sight between the camera(s) and the receiver. If digital wireless cameras are outdoors and have a clear line of sight, they typically have a range between 250 and 450 feet. If located indoors, the range can be limited to 100 to 150 feet.

4. Blink Home - Wikipedia

   en.wikipedia.org/wiki/Blink_Home

   In July 2014, the company had a Kickstarter campaign for their indoor security camera, which raised over US$1 million. [2] Subsequently, Blink later announced an outdoor security camera, [3] home security system, [4] and video doorbell. [5] Amazon announced in December 2017 that they had acquired the company. [6]

5. Closed-circuit television - Wikipedia

   en.wikipedia.org/wiki/Closed-circuit_television

   [93] [94] [95] New York City's Domain Awareness System has 6,000 video surveillance cameras linked together, [96] there are over 4,000 cameras on the subway system (although nearly half of them do not work), [97] and two-thirds of large apartment and commercial buildings use video surveillance cameras.

6. AOL

   search.aol.com

   The search engine that helps you find exactly what you're looking for. Find the most relevant information, video, images, and answers from all across the Web.

7. Indoor positioning system - Wikipedia

   en.wikipedia.org/wiki/Indoor_positioning_system

   A large variety of techniques and devices are used to provide indoor positioning ranging from reconfigured devices already deployed such as smartphones, WiFi and Bluetooth antennas, digital cameras, and clocks; to purpose built installations with relays and beacons strategically placed throughout a defined space. Lights, radio waves, magnetic ...