Specifications:Item: Handheld Digital LCD Stopwatch Timer Material: Plastic Suitable: For running, referee, horse racing, cycle racing, swimming, etc. Product size: Approx 8*6*2cm/3.1*2.4*0.8inch Weight: Approx 76g/2.7oz Package list: 2 * Stopwatch Timers How to Use: Stopwatch setting: Under the normal time display, press the MODE button once, you will see the stopwatch status, press the START button (right button) to start the timer. You need to stop and press the START button again, and then press the START button again. When the stopwatch is stopped, press the SPLIT button (left button) to reset to zero. Alarm time setting: Under the normal time display, press the second MODE button, you will see the alarm time setting state, then press the START button (right button) to start the adjustment, press the SPLIT button (left button). Will turn into the score. Time setting: Under normal time display, press MODE button three times, you will see the number of seconds flashing, press SPLIT button (left button), you will see the score flashing, then press START button (right button) to score Adjust it, press the SPLIT button (left button) to see the number of hours flashing, then press the START button (right button) to adjust the number of hours, press the SPLIT button (left button) to see the number of days flashing, then Press the START button (right button) to adjust the number of days. Do this. After adjusting the number of months and weeks, press the MODE button to exit. Alarm switch: Press and hold RESET and then press START/STOP.