5 Second Countdown HD - with Sound Effect (without copyright) - YouTube
The Countdown Clock - YouTube
5 Second Timer with Voice Countdown - YouTube
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10 Second Countdown Sound Effects - 146 10 Second Countdown sounds for SFX projects | Pond5
Beats by Talent - 10 Second Countdown (Sound Effect) MP3 Download & Lyrics | Boomplay
Free Countdown Sound Effects Download - Pixabay
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Download Free Countdown Sound Effects | Mixkit
Freesound - "VOCODER countdown.wav" by lennartgreen
Freesound - "countdown 30 seconds.wav" by drotzruhn