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2. The 5 best battery-operated video doorbells that install ...

   www.aol.com/lifestyle/5-best-battery-operated...

   Video doorbells add an extra layer of security to your home. These battery-operated video doorbells don't need any wiring to work. The 5 best battery-operated video doorbells that don't need wiring

3. Smart doorbell - Wikipedia

   en.wikipedia.org/wiki/Smart_doorbell

   The smart doorbell lets the home owner use a smartphone app to watch and talk with the visitor by using the doorbell's built-in high-definition infrared camera and microphone. They can be either battery operated or wired. [1] Some smart doorbells also allow the user to open the door remotely using a smart lock. [2]

4. 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]

5. Electronic lock - Wikipedia

   en.wikipedia.org/wiki/Electronic_lock

   The key contains a power supply device, usually a rechargeable battery or a replaceable battery in the key, used to drive the system to work; it also includes an electronic storage and control device for storing the identification code of the lock. The software is used to set and modify the data of each key and lock. [2]

6. Hilarious Horse Hams It up Instead of Following Script When ...

   www.aol.com/hilarious-horse-hams-instead...

   The video starts with the actors standing near Wesley and another horse. The actor is checking out something on his phone. Instead of Wesley just standing in the background, he decides to ham it ...

7. Intrinsic safety - Wikipedia

   en.wikipedia.org/wiki/Intrinsic_safety

   Intrinsic safety (IS) is a protection technique for safe operation of electrical equipment in hazardous areas by limiting the energy, electrical and thermal, available for ignition. In signal and control circuits that can operate with low currents and voltages, the intrinsic safety approach simplifies circuits and reduces installation cost over ...