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Dawn simulation is a technique that involves timing a light, often called a wake-up light, sunrise alarm clock, or natural light alarm clock, in the bedroom to come on gradually, over a period of 30 minutes to 2 hours, before awakening to simulate dawn.
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.
The chronograph digital watches, typically made of molded plastic, invariably featured an alarm and utilized LCD screens to display the time for their wearers. [5] In time the company began manufacturing multi-purpose units that used the LCD screen to combine time display functions with simple video game functions.
The following is a list of notable companies that produced, or currently produce clocks. Where known, the location of the company and the dates of clock manufacture follow the name. In some instances the "company" consisted of a single person.
The term real-time clock is used to avoid confusion with ordinary hardware clocks which are only signals that govern digital electronics, and do not count time in human units. RTC should not be confused with real-time computing, which shares its three-letter acronym but does not directly relate to time of day.