An alarm clock is a clock with an alarm clock. It can indicate time and send out sound signals or other signals at predetermined times. The main structure of the alarm clock is mechanical and quartz electronic. Other types, such as transistor cycloidal, tuning fork, etc., have been rarely used. The alarm clock, which is usually placed on the table, is called the travel alarm clock. The time error of the daily mechanical alarm clock is generally within 120 seconds/day, while the time error of the quartz electronic alarm clock is generally within 0.2 seconds/day.
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