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2. Security alarm - Wikipedia

   en.wikipedia.org/wiki/Security_alarm

   Wireless home alarm system control panel A house alarm. 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 or property damage, as well as against intruders. Examples include personal systems, neighborhood ...

3. Smart doorbell - Wikipedia

   en.wikipedia.org/wiki/Smart_doorbell

   A smart doorbell is an internet-connected doorbell that notifies the home owner on his or her device (smartphone or any other gadget) when a visitor arrives at the door. 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 ...

4. Home security - Wikipedia

   en.wikipedia.org/wiki/Home_security

   Door and window sensors are also implemented in most home security systems. One part of the system is installed on the door or window itself while the other part is installed on the frame of the door or window. The two part system connects securely when a door or window is closed, creating a security circuit. [5]

5. 7 Best Alarm Clocks for Heavy Sleepers, According to a Sleep ...

   www.aol.com/lifestyle/7-best-alarm-clocks-heavy...

   Shop the best loud alarm clocks for heavy sleepers on Amazon and more that are recommended by our editor, who tested several of them, and a sleep psychologist. 7 Best Alarm Clocks for Heavy ...

6. 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]

7. Smart lock - Wikipedia

   en.wikipedia.org/wiki/Smart_lock

   A smart lock is an electromechanical lock that is designed to perform locking and unlocking operations on a door when it receives a prompt via an electronic keypad, biometric sensor, access card, Bluetooth, or Wi-FI from a registered mobile device. These locks are called smart locks because they use advanced technology and Internet ...