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This timer counts down silently until it reaches 0:00, then a police siren sounds to alert you that time is up. 87 Free videos of Countdown. Related Images: timer clock numbers time start count counter startup seconds countdown. Countdown, Timer, StartHD 0:10 Numbers, Counter, Digits4K 0:12 Clock, Countdown, TimeHD 0:11 Hourglass, Sand, TimeHD 0:15 Countdown, 10 SecondsHD 0:08