The STW515 from Extech is a digital stopwatch and clock. This stopwatch features a 12 or 24-hour clock format and a programmable alarm with hourly chime. It also offers three stopwatch modes: elapsed timer, split time, and timer for two competitors. The backlight can be used for display at night or in low-light areas and automatically turns off after five seconds. The calendar shows the day, month, and weekday. Complete with a CR2032 battery and a 1-meter long detachable lanyard.