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2. Wireless security camera - Wikipedia

   en.wikipedia.org/wiki/Wireless_security_camera

   However, some wireless security cameras are battery-powered, making the cameras truly wireless from top to bottom. Wireless cameras are proving very popular among modern security consumers due to their low installation costs (there is no need to run expensive video extension cables) and flexible mounting options; wireless cameras can be mounted ...

3. Doorbell - Wikipedia

   en.wikipedia.org/wiki/Doorbell

   Doorbell mechanism from 1884 in Andrássy Avenue, Budapest Antique mechanically operated shop doorbell on a torsion spring. William Murdoch, a Scottish inventor, installed a number of his own innovations in his house, built in Birmingham in 1817; one of these was a loud doorbell, that worked using a piped system of compressed air. [1]

4. Wireless intercom - Wikipedia

   en.wikipedia.org/wiki/Wireless_intercom

   Another reason is the increased portability of a wireless system. With battery-powered radio frequency wireless intercom units, a person can carry a station as they walk around. One of the challenges of a wireless system is the possibility of interference. Radio frequency wireless systems may get interference from other wireless devices.

5. Home security - Wikipedia

   en.wikipedia.org/wiki/Home_security

   Surveillance cameras used in houses are IP cameras or closed circuit. IP cameras connect over the internet and stream to users’ phones using a Wi-Fi connection. Closed-circuit, or CCTV cameras, stream through wired or wireless links. [9] These cameras stream live footage to users, allowing them to watch for suspicious activity.

6. Covert listening device - Wikipedia

   en.wikipedia.org/wiki/Covert_listening_device

   A covert listening device, more commonly known as a bug or a wire, is usually a combination of a miniature radio transmitter with a microphone. The use of bugs, called bugging, or wiretapping is a common technique in surveillance , espionage and police investigations.

7. Vivint - Wikipedia

   en.wikipedia.org/wiki/Vivint

   Vivint offers a range of integrated smart home and security products, including cameras, locks, safety sensors, thermostats, lighting, managed through the Vivint Smart Hub and mobile app. [2] As of 2024, Vivint has over two million customers across all fifty states with more than 27 million devices managed .