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  2. 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 ...

  3. Doorbell - Wikipedia

    en.wikipedia.org/wiki/Doorbell

    Doorbell at the entrance of Chetham's Library, Manchester, England Sound of a two-tone mechanical doorbell. A doorbell is a signaling device typically placed near a door to a building's entrance. When a visitor presses a button, the bell rings inside the building, alerting the occupant to the presence of the visitor. Although the first ...

  4. Z-Wave - Wikipedia

    en.wikipedia.org/wiki/Z-Wave

    Z-Wave is a wireless communications protocol used primarily for residential and commercial building automation. It is a mesh network using low-energy radio waves to communicate from device to device, [2] allowing for wireless control of smart home devices, such as smart lights, security systems, thermostats, sensors, smart door locks, and garage door openers.

  5. 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]

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  8. Range extender - Wikipedia

    en.wikipedia.org/wiki/Range_extender

    The range-extender option costs an additional US$3,850 in the United States, [27] an additional €4,710 (~ US$6,300) in France, [28] and €4,490 (~ US$6,000) in the Netherlands. [29] The range-extender option of the BMW i3 was designed to meet the CARB regulation for an auxiliary power unit (APU) called REx.

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