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A security alarm is a system designed to detect intrusions, such as unauthorized entry, into a building or other areas, such as a home or school. Security alarms protect against burglary ( theft ) or property damage , as well as against intruders.
The system consisted of Nest Guard (an alarm, keypad, and motion sensor with embedded microphone), Nest Detect (a door/window and motion sensor), and Nest Tag (a key chain fob). [78] The product was released in November 2017.
MagSafe is a series of proprietary magnetically attached power connectors developed by Apple Inc. for Mac laptops. MagSafe was introduced on 10 January 2006, in conjunction with the MacBook Pro, the first Intel-based Mac laptop, at the Macworld Expo.
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A non-contact method based on magnetic induction was preferred, to eliminate the problems caused by snowfall and day-to-day wear of the contacts which had been discovered in existing systems. The Strowger-Hudd system of Alfred Ernest Hudd ( c. 1883 – 1958) used a pair of magnets, one a permanent magnet and one an electro-magnet, acting in ...