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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 .

  3. Chime (company) - Wikipedia

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

    Chime launched Credit Builder with Stride Bank, N.A in June 2020, which is a credit card designed to help consumers build their credit history. [37] Chime was the most downloaded digital banking app in the U.S. during the first half of 2021, according to data collected by Apptopia.

  4. 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]

  5. 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.

  6. 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]

  7. Dynamic frequency scaling - Wikipedia

    en.wikipedia.org/wiki/Dynamic_frequency_scaling

    The dynamic power (switching power) dissipated by a chip is C·V 2 ·A·f, where C is the capacitance being switched per clock cycle, V is voltage, A is the activity factor [1] indicating the average number of switching events per clock cycle by the transistors in the chip (as a unitless quantity) and f is the clock frequency.

  8. Macintosh startup - Wikipedia

    en.wikipedia.org/wiki/Macintosh_startup

    A similar-sounding variant of this startup chime can also be heard during the "Simplicity Shootout" commercial shown at the iMac G3's introduction in 1998. Initially, this revised startup chime was only used on Intel-based Macs with a T2 security chip, with most of the other models at the time (including older ones) still using the previous ...

  9. NBC chimes - Wikipedia

    en.wikipedia.org/wiki/NBC_chimes

    An NBC account of its employment at the start of the "D-day" invasion on June 6, 1944, stated: "At 2:30 a.m. the network was put on 'flash' basis; the NBC four-chime-alert calling all newsmen and commentators to their microphones, key operating personnel to their stations, sounded from the newsroom control room." [32]