This handheld calculator adds, subtracts, multiplies and divides time. 12 or 24 hour format. Decimal hours or hours, minutes, and seconds. Includes built-in stopwatch/timer. Audible alarm. Paperless tape feature permits review of last 10 entries. Rate key instantly determines total pay. Also works as a standard math calculator. Toll-Free 800# support line. Comes with case and long life battery. LCD display.