This clock is essential equipment in any environment where timing is necessary. In STOPWATCH MODE the clock times with minutes-seconds-hundredth of seconds. In INTERVAL TIMER MODE the timer can program a desired work period followed by a rest period and the number of times you repeat the exercise. You can also store up to 8 programs for easy recall on the fly. STOPWATCH DISPLAYS MINUTES- SECONDS HUNDREDTHS VISIBLE UP TO 200 FEET TIMER COUNTS DOWN FROM 99 Hours, 59 minutes, 59 seconds TIMER COUNTS UP TO 99 Hours, 59 minutes, 59 seconds STOPWATCH counts up to 99 minutes, 59 seconds and hundredths of seconds INTERVAL TIMING program work, rest time, repeats and store programs .AND OF COURSE A PRECISION STAND -ALONE CLOCK WITH SECONDS. Power source: 110 volt AC adapter is included 1 Year warranty 2.5 lbs.