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Digital travel alarm clock This makes it possible to integrate numerous additional functions that would be difficult or impossible to implement in mechanical or electromechanical alarm clocks. In addition to the usual tasks of digital clocks, in some models, additional alarms can be preset depending on the day of the week or an automatic alarm ...
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Digital clocks typically use the 50 or 60 hertz oscillation of AC power or a 32,768 hertz crystal oscillator as in a quartz clock to keep time. Most digital clocks display the hour of the day in 24-hour format; in the United States and a few other countries, a commonly used hour sequence option is 12-hour format (with some indication of AM or PM).
A mid-1940s alarm clock radio with AM radio stations only A typical 1980s clock radio featuring a digital clock/alarm and an analogue FM/MW/LW receiver. A clock radio is an alarm clock and radio receiver integrated in one device. [18] The clock may turn on the radio at a designated time to wake the user, and usually includes a buzzer alarm.
Beginning in 1943, Westclox and other companies introduced clocks for the civilian market that used much less brass than previously. Clocks were labeled as "Waralarm" by Westclox and only referenced city of origin; no mention of maker appeared. Other clock companies also produced clocks that were labeled "War Alarm", such as Gilbert and Telechron.
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