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2. I Tried the Ring Pro 2 Video Doorbell—Here’s My Honest Review

   www.aol.com/lifestyle/tried-ring-pro-2-video...

   A clear, reliable, and easy-to-use video doorbell is a significant improvement from the old push-button standby. We tried the Ring Video Doorbell Pro 2 to see if it's worth your time and money.

3. Ring (company) - Wikipedia

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

   The Ring Doorbell Pro interoperates with Amazon Alexa to play prerecorded greetings to visitors and allow visitors to leave a message. [45] 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]

4. Resonant inductive coupling - Wikipedia

   en.wikipedia.org/wiki/Resonant_inductive_coupling

   This process occurs in a resonant transformer, an electrical component which transformer consists of high Q coil wound on the same core with a capacitor connected across a coil to make a coupled LC circuit. The most basic resonant inductive coupling consists of one drive coil on the primary side and one resonance circuit on the secondary side.

5. Transformer types - Wikipedia

   en.wikipedia.org/wiki/Transformer_types

   Leakage transformers are used for arc welding and high voltage discharge lamps (neon lights and cold cathode fluorescent lamps, which are series connected up to 7.5 kV AC). It acts both as a voltage transformer and as a magnetic ballast. Other applications are short-circuit-proof extra-low voltage transformers for toys or doorbell installations.

6. Electric bell - Wikipedia

   en.wikipedia.org/wiki/Electric_bell

   These were single-stroke bells: applying current to an electromagnet pulled the bell's clapper against the bell or gong and gave one chime. The bell did not ring continuously, but only with a single ring, until current was applied again. To sustain the tone, these bells were usually much larger than are used today with interrupter bells.

7. Toroidal inductors and transformers - Wikipedia

   en.wikipedia.org/wiki/Toroidal_inductors_and...

   Toroidal inductors and transformers are inductors and transformers which use magnetic cores with a toroidal (ring or donut) shape. They are passive electronic components , consisting of a circular ring or donut shaped magnetic core of ferromagnetic material such as laminated iron , iron powder, or ferrite , around which wire is wound.