Features:1. Professional stopwatch timer for referee and match.2. Multifunctional sports stopwatch, create your own miracle and record.3. Suitable for many places like school, athletic meeting, gym, etc.4. Wide use - can be used for various different activities like racing, running, swimming, etc.5. Long lifespan - made of superior raw material, guarantee long service time. Specifications:Item: Stopwatch TimerMaterial: PlasticColor: Yellow, Black optionalSuitable: For racing, running, swimming, etc.Weight: Approx 45g/1.6ozSize: Approx 6*6*2cm/2.4*2.4*0.8inch Package list: 1 * Stopwatch Timer How to Use: Stopwatch timer: In the normal walking state, press the M key to use the stopwatch to enter the timing state, if the stopwatch display is not zero, press the D key to stop timing, press the S key to reset to zero.Time, calendar and alarm display: In the normal walking state, press D to display the month, day and week, press S to display the alarm time.Time and calendar setting: in the normal walking state, press the M button 3 times to enter the time setting state. The seconds and day of the week display flash simultaneously. Press S to select the minute, hour, day, month, week, and second as the adjustment target. After the adjustment is completed, press the M key to return to the normal state..