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Timer is a specialized type of Clock for measuring time intervals. By function timers can be categorized to two main types. A timer which counts upwards from zero for measuring elapsed time is often called a Stopwatch; a device which counts down from a specified time interval is more usually called a timer or a Countdown Timer. A simple example for this type is an hourglass. By working method timers have two main groups: Hardware and Software timers. Some timers sound an audible indication that the time interval has expired.