Stopwatch with date and day

Method of using the stopwatch: press the (B) button once to enter the stopwatch mode. press the (C) button to start / stop the stopwatch timing. press the (A) button to stop or reset the stopwatch. Method of changing the battery: unscrew the screws of the back cover. open the back cover, then remove the old battery. install a new battery (AG-13), press the back cover, and tighten the screws. *When the screen cannot be displayed after removing the insulating paper, please reinsert the battery.