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Some alarm systems serve a single purpose of burglary protection; combination systems provide fire and intrusion protection. Intrusion-alarm systems are combined with closed-circuit television surveillance (CCTV) systems to record intruders' activities and interface to access control systems for electrically locked doors. There are many types ...
An electromagnetic door holder (electromagnetic door holder and release or hold-open device, sometimes informally called a mag hold open or electric doorstop) is a simple electromechanical mechanism which can be used to hold a fire door or security door open until given a signal to release.
SimpliSafe also integrated with Amazon Alexa in 2018. Alexa users are able to check their system status with voice commands, as well as arm — but not disarm — their system. [36] On Sep 19, 2018, SimpliSafe integrated with Google Assistant. As with Alexa, SimpliSafe users can check their system status or arm their system with voice commands ...
In November 2013, Ring was founded as Doorbot by Jamie Siminoff. Doorbot was crowdfunded via Christie Street, and raised US$ 364,000, more than the $250,000 requested. [1] [4] [5] Siminoff's team envisioned the product's concept as an "alarm system literally turned inside out" in comparison to other security systems, describing it as a "pre-crime" system. [6]
In 1971, Bose Corporation sued Consumer Reports (CR) for libel after CR reported in a review that the sound from the system it reviewed "tended to wander about the room". [75] The case eventually reached the United States Supreme Court , which affirmed in Bose Corp. v. Consumers Union of United States, Inc. that CR 's statement was made without ...
The most basic type of electronic lock is a magnetic lock (informally called a "mag lock"). A large electro-magnet is mounted on the door frame and a corresponding armature is mounted on the door. When the magnet is powered and the door is closed, the armature is held fast to the magnet. Mag locks are simple to install and are very attack ...