AIM MULTICHRON STOPWATCH AIM MULTICHRON STOPWATCH AIM AiM MultiChron Stopwatch A versatile hand-held digital lap timer that tracks up to four different racers simultaneously Start or stop all 4 timers at once, or each individually. The huge memory holds 99 laps per car, with up to 9 split times per car per lap. Backlit display shows fastest lap times at any time, even while the watch is still running. A secondary backup battery keeps the memory intact if the primary battery dies. Backlit display window measures 1" x 1 1/8" (25.5 x 29 mm). Weighs less than 4 ounces (just 100 g) including batteries. Includes quick-release lanyard. Special Features of the MultiChron Stopwatch SPECIAL START MODES MultiChron stopwatch features 2 different starting modes to match a variety of racing situations: "One Start" mode allow you to activate the start for all competitors pressing one only button: for races where all competitors start at the same time. "Multi Start" mode allows you to activate the start for each competitor independently: for races where competitors start at different times. Innovative programming allow you to get accurate times even when your racers are close together at the lap marker: selecting 'Multi Key' you can attribute times to each racer pressing 1, 2, 3, or 4 button. Selecting 'One Key' you get all 4 times pressing the same key and then you attribute times to each racer. It's a quite useful mode in case of a final rush.