The screw lock type button features a mechanism that can securely lock the button when it is not being operated in order to prevent any operational errors.
It is necessary to unlock the screw lock type button before operating it.
Once you have finished operating the button, make sure to relock it.
If the screw or button get dirty, they may not operate properly. Daily care
Note that if you turn the button ring more than you need to, the screw lock button may be difficult to return to its original position.
Do not use the buttons when the watch is wet or when you are underwater.