Timer. Beeps at random intervals.
This video is around 15 minutes long, starts with a 10 second countdown to get ready and then continues with random intervals marked by a beep sound with a fixed image as background.
It can be used to time a variety of activities: Work out or exercise routine, stretch routine, practice sport skills, practice reaction time and whatever you can imagine.
Check out the channel for other time intervals and versions of the same interval.
