Time, calendar display, timing alarm (12 24 hour standard conversion, 1 100 second precise timing). Large screen display, stainless steel shell anti slip and shockproof design. Easy to replace the battery (using the G13 button battery). Stopwatch timing In the normal running 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 the timing, and 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. Set the time and calendar Press the M button 3 times in the normal walking state 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 travel time state. Battery replacement When the display is dark or no display, the battery should be replaced. Use the screwdriver to take the old battery in the back table inside the cover, and then replace it with a new battery of the same specification, then install the back cover of the watch.