These Satz School Stopwatch are affordable uncomplicated event timer. Colour coded buttons for easy reference. Start - stop - reset. Capacity: 9hrs 59 mins 59 secs. Large clear display. Safety wrist cord. Battery securely fitted behind back casing.Easy to teach operation because each button is a different colour (Blue: Lap/Reset; Red: Start/Stop; Yellow: Mode)Buttons cannot be pulled offBattery S1154S securely fitted behind back of casing1/100 second timing with 23h 59m 59s capacity12/24hr formats for user's optionNeck cord (100cm long) includedLap and split timingAuto-calendar hourly chime daily alarm with snooze functionAnti-shaken structureTheft deterrent 'School Stopwatch' printed on the frontSize: 60mm x 80mm