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. Spec: Item: Stopwatch Timer Material: Plastic Color: Yellow, Black optional Suitable: For racing, running, swimming, etc. Weight: Approx 45g/1.6oz Size: 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.