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2. Doorbell - Wikipedia

   en.wikipedia.org/wiki/Doorbell

   Pressing the doorbell button, a single-pole, single-throw (SPST) pushbutton switch momentarily closes the doorbell circuit. One terminal of this button is wired to a terminal on a transformer. A doorbell transformer steps down the 120 or 240-volt AC electrical power to a lower voltage, typically 6 to 24 volts. The transformer's other terminal ...

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. Electric bell - Wikipedia

   en.wikipedia.org/wiki/Electric_bell

   One of the first was the oscillating electric wire invented by James Marsh in 1824. [6] [5] This consisted of a wire pendulum dipping into a mercury trough, suspended between the poles of an electromagnet. When current was passed through the wire, the force of the magnet made the wire swing sideways, out of the mercury, which broke the current ...

5. Google Nest - Wikipedia

   en.wikipedia.org/wiki/Google_Nest

   In 2021, Google announced the battery-powered Nest Doorbell, while the original Nest Hello was rebranded as the Nest Doorbell (wired). [67] In October 2022, the 2nd generation Nest Doorbell (wired) was launched in the US, adding back a number of features that were missing from the Nest Doorbell (battery) even when wired, including 24/7 ...

6. Ring (company) - Wikipedia

   en.wikipedia.org/wiki/Ring_(company)

   The "Ring Chime" accessory is a unit plugged into a power outlet to play the doorbell's chime. The "Chime Pro" is an extended version that also doubles as a wireless repeater for Wi-Fi networks. [46] In November 2020, Amazon announced the recall of 350,000 Ring doorbells in the United States and 8,700 in Canada due to a potential fire risk. [47]

7. The best tech for adults over 65 we spotted at CES this year

   www.aol.com/lifestyle/ces-2025-aging-in-place...

   We found the best technology for adults over 65 at CES this year. From AI aids to ‘aging in place’ smart home solutions, the annual tech show kept older users in mind.