For runners, swimmers, and skaters. Test your reaction time.
At first, select RUN or SWIM or SKATE.Then push START/STOP button.After 3-5 seconds(length is random),RUN: Set => interval((length is random) => BANGSWIM: Take your marks => interval((length is random) => BANGSKATE: Ready => interval((length is random) => BANGAfter the sound, push START/STOP button as soon as possible.When red F appears, its false start.If you feel difference between the sound and counter start, push DELAY and change number.