Square digital watch. It is equipped with a referee additive timer that can measure loss time, a preset timer that sets the competition time for major ball games, and an interval timer. Water resistant to 10 ATM. World time: Time display of 48 cities around the world (29 time zones) with daylight saving setting function; Stopwatch: An additional timer for referees that can measure the time of the loss. Display top level: Game time measurement (1 second, 60 minutes), Bottom display level: Elapsed time measurement (1 second, 100 minutes), target alert (game time) can be set (set unit: 1 minute, maximum set: 60 minutes). Preset timer: 9 kinds of playing times of the main ball game, preset time: 10 minute, 12 minute, 15 minute, 20 minute, 20 minute, 20 minute, 25 minute, 20 minute, 25 minute, 25 minute, 25 minute, 25 minute. 30 minutes / 3 minutes 5 minutes/40 minutes/45 minutes; Measures in 1 second increments, Auto repeat count; Interval Timer: Up to 9 time settings (set unit: 5 seconds; Maximum Set: 59 minutes 55 seconds, 1 second increments; Auto repeat); Time alarm/hourly signal; Fully automatic calendar; Switch between 12/24 hour displays; Functions ON/OFF Off switching function. LED backlight (with afterglow function).