This is a simple count down clock where the background changes from green to yellow (when warn 1 time is remaining) and finally to red (when warn 2 time is remaining). This is intended for speakers to let them know how much time they have left for their talk. The count down is controlled with keyboard shortcuts: [space] start/pause/resume count down [r] reset count down when paused or finished [c] change the total time, warn 1 time, and warn 2 time when count down is reset