Introduction - If you have any usage issues, please Google them yourself
1. With a plus or minus sub-function (1,2,3 points), and in digital tube display both the score 2. With timing function, the total time per session countdown, 24S countdown, countdown to the sound and light alarm 3. Press the plus or minus key to display and enter the plus or minus points, usually display time, the time accurate to 0.1S 4. With a pause, start function