The application is designed for slalom contest (riding along line).
The application can operate in two modes (mode can be selected in the settings):
1) Conventional stopwatch
2) Using EV3 robot (click the "Use EV3").
Instructions how to use LEGO EV3 is the link http://robocity.dp.ua/rjs-slalom
The app allows you to save 100 of the best results with a note for each attempt.