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A typical kitchen timer. A timer or countdown timer is a type of clock that starts from a specified time duration and stops upon reaching 00:00. An example of a simple timer is an hourglass. Commonly, a timer triggers an alarm when it ends. A timer can be implemented through hardware or software.
Though the style and colour scheme of the set have changed many times (and the show itself moved to Manchester after more than 25 years in Leeds), the clock has always provided the centrepiece and like the clock music (composed by Alan Hawkshaw), it is an enduring and well-recognised feature of Countdown.