Product functions the A601x Series is our most popular and durable stopwatch for your basic timing needs. Now available in our popular rainbow 7 pack. You will receive (1) each of Blue, Red, Yellow, green, orange, Purple plus 1 free black. it works on the WOS 2.5 operating system it takes cumulative splits only (no lap) split/release action 1, 2 fast finish event/time out 24 hour timing range the timing interval is 1/100 seconds to 40 minutes 12/24 time of day month and date product features cased in ACCUSPLIT's exclusive "X" performance case, with its distinctive, ergonomic design. The "X" case is immediately recognizable to anyone involved in Elite sports million cycle no fail buttons (no beep) 5 year. Red, Yellow, green, orange, Purple and black resolution & accuracy limit: the internal quartz and ic controller looks at switch closure every 1/256th of a second, so that nearest 1/100 is captured. actual accuracy: tested and calibrated to be within 0.04 sec/hour for 12 months. Only shocks and aging of the quartz crystal affect this actual accuracy rating.