Product Functions Marathon timer: Count up from zero to max 99 hours 59 minutes 59 seconds. Marathon time display will restore and continue running if there is a sudden power outage. Clock :Optional 12-hour and 24 -hour (military time) display Count up timer: Custom set time to count up from, max count up to 99 hours 59 minutes 59 seconds Count down timer: Custom set time to count down from, ax count down from 99 hours 59 minutes 59 seconds Stopwatch timer ( MM:SS:MS display): Max count up to 99 minutes 59 seconds and 99 hundredths of a second Interval timer: Program workout time, rest time and repeating rounds, store custom setting programs Fight Gone Bad timer: Pre-programmed interval timer, 3 rounds of 5 x 1 minute workout and then 1 minute rest Tabata timer: Pre-programmed interval timer, 20 seconds workout and 10 seconds rest for 8 rounds Product Features ldeal for 5K,10K, Half Marathon, Full Marathon Races, and More! Choose one side or double-sided display. If IR remote control, up to 15 meters very efficient long distance control, up to 150 meters control distance then select wireless remote control. Available to custom synchronizing feature, one master clock and remaining slave clocks.