Avoid prolonged exposure to sunlight and strong lightAvoid using in high or low temperaturesAvoid getting wet and cannot be used under rainAvoid contact with corrosive substances; if not in use for a long time, the batteryAlarm 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 be transferred to the points.1 X Multi-function Sports StopwatchStopwatch setting use: Under the normal time display, press MODE once, you will see the stopwatch status, button (right button) to start timing, stop and button again, continue to button again. . When the stopwatch is stopped, press the SPLIT button (left button) to reset to .There is a strap on the stopwatch that can be wrapped around your hand or hung around your neck.This sport timer is a must for crowds of runners, coaches and refereesTime 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 button (right button) After the score is adjusted, 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, wait for the number of months and weeks to be adjusted, press the MODE button to .Use Scenarios: counters, stopwatches, timers, compasses, etc.Use split time functions to accurately measure multiple events of high quality products.Versatile, to meet your different needs.Replaceable battery, can be reused to avoid waste.Alarm switch: Press and hold and /STOP.