The ACCUPLIT Series Stopwatches have been the premier timeing piece for elite level sports including Track and Field, Swimming, Baseball and Football. All of these watches are designed on the ACCUSPLIT Operating System (AOS), which is exclusive technology desighned by ACCUSPLIT over the last 33 years. The AOS includes One Button Rapid Split/Reset (2 sec.) and No Fail Operating System. The ACCUSPLIT Operating System is designed to give coaches, athletes and timers the most precise timing available. The 605XE includes: * 10 Hour Range * Time-Out * Single Event * Water Resistant * Long Life Switches * 5 Year Warranty