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2. Doorbell - Wikipedia

   en.wikipedia.org/wiki/Doorbell

   Pressing the doorbell button allows both negative and positive sides of the AC power signal to flow into the circuit, while releasing the button only allows either the positive or negative side to flow into the circuit. By differentiating the full and half wave signals, the doorbell is able to function as it does in the previous wired case ...

3. Door phone - Wikipedia

   en.wikipedia.org/wiki/Door_phone

   Video door phone indoor terminal.. Going a little further in time, we find video door phones featuring a video installation apart from the classical audio. In these cases, the intercom plate has the same structure as the previous version but features a video monitor connected to a surveillance camera that allows inspecting the person who pressed the button and part of the surrounding area.

4. Video door-phone - Wikipedia

   en.wikipedia.org/wiki/Video_door-phone

   Video door entry consists of both outside and indoor elements: an outdoor panel on the outside, an electronic lock release, and an indoor monitor. The outdoor panel or street panel is installed beside the entrance door or gateway and incorporates different elements ready for use in any climate conditions: one or several pushbuttons to make the call (usually one per home or apartment), a micro ...

5. Electrical wiring - Wikipedia

   en.wikipedia.org/wiki/Electrical_wiring

   Electrical wiring is an electrical installation of cabling and ... control applications such as doorbell ... glass or porcelain buttons was used near the turn of the ...

6. 35 of the very best gifts for seniors that they'll actually ...

   www.aol.com/lifestyle/best-gifts-for-seniors...

   A video doorbell is an excellent security tool, allowing you to see who's at your front door whether you're home or not. It can detect humans, pets, package delivery and more.

7. Bernese Mountain Dog Has His Own Doorbell and He’s ... - AOL

   www.aol.com/bernese-mountain-dog-own-doorbell...

   Treat and reward your dog for interest or engagement with the bell or button. Step 2: Place the bell or button near the door that you use most frequently to take your dog out to potty. Each time ...