Extech’s STW515, digital stopwatch and clock, features a 12- or 24-hour clock format and programmable alarm with hourly chime. It also includes three Stopwatch Modes: Elapsed Timer, Split Time, and TwoCompetitor Timer. The backlight can be used for viewing at night or in dimly lit areas and turns off automatically after five seconds. Calendar displays day, month, and weekday. Complete with CR2032 battery and 39" (1m) snap-away neck strap.