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  2. Alarm clock - Wikipedia

    en.wikipedia.org/wiki/Alarm_clock

    This is an accepted version of this page This is the latest accepted revision, reviewed on 23 January 2025. Type of clock A traditional wind-up (key-wound), mechanical spring-powered alarm clock An alarm clock or alarm is a clock that is designed to alert an individual or group of people at a specified time. The primary function of these clocks is to awaken people from their night's sleep or ...

  3. Radio clock - Wikipedia

    en.wikipedia.org/wiki/Radio_clock

    A modern LF radio-controlled clock. A radio clock or radio-controlled clock (RCC), and often colloquially (and incorrectly [1]) referred to as an "atomic clock", is a type of quartz clock or watch that is automatically synchronized to a time code transmitted by a radio transmitter connected to a time standard such as an atomic clock.

  4. Sony Dream Machine - Wikipedia

    en.wikipedia.org/wiki/Sony_Dream_Machine

    A clock radio that has a different alarm sound and has a volume control and two different alarms. This one comes in the MK2 version as well, It has a red LED display, and for the MK2, it has a green LED display. The first alarm is a radio alarm and the second one is the buzzer, Two bands; FM and AM.

  5. Travel alarm clock - Wikipedia

    en.wikipedia.org/wiki/Travel_alarm_clock

    A wristband travel alarm clock was patented in 1908 by the Eterna company. The best-known wristband-type travel alarm clock models were Jaeger-LeCoultre's Memovox in 1950 and Pierce's Duofon in 1955. [8] While the dwellings adapted to the contemporary taste of the society, the technology remained the same for a long time. Only with electronics ...

  6. Telechron - Wikipedia

    en.wikipedia.org/wiki/Telechron

    Telechron electric alarm clock. Telechron alarm clocks are particularly popular with collectors. Until about 1940, the overwhelming majority of Telechron alarm clocks had bell alarms. The entire mechanism was enclosed in a bell housing of steel. Atop the clock's coil was a metal strip that vibrated at 60 cycles per second when the alarm was ...

  7. Time signal - Wikipedia

    en.wikipedia.org/wiki/Time_signal

    Time stations operating in the longwave radio band have highly predictable radio propagation characteristics, which gives low uncertainty in the received time signals. Stations operating in the shortwave band can cover wider areas with relatively low-power transmitters, but the varying distance that the signal travels increases the uncertainty ...

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