1. Professional stopwatch for referees and competitions.2. Multi-functional sports stopwatch to create its own miracle and save it.3. Suitable for schools, sports games, stadiums and other places.4. Wide range of uses-can be used in a variety of different activities, such as running, running, swimming, etc.5. Long service life-made of high-quality raw materials to ensure long service life.Specifications:Item: stopwatch timerMaterial: PlasticColor: yellow, black optionalSuitable for: running, running, swimming, etc.Weight: about 45g / 1.6ozSize: About 6*6*2cm/2.4*2.4*0.8 inchPacking list:1 * stopwatch stopwatchUsage:Stopwatch stopwatch: in normal working state, press the M key to enter the stopwatch state. If the stopwatch is not zero, press the D key to stop the stopwatch and press the S key to reset.Time, calendar, and alarm clock display m: in the normal working state, the month, day, and Week are displayed by D, and the alarm clock time is displayed by S.Time and calendar settings: in the normal working state, press the M key for 3 times to enter the time setting state. The second and week displays flashing at the same time. Select minutes, hours, days, months, and, week and second are the adjustment targets. After the adjustment is completed, press the M key to return to the normal state.