It looks like you're looking for a described in the manual for a J-axis Cybeat Watch .
: Clean the watch with a soft, dry cloth. Avoid chemical cleaners. Water Safety : While water-resistant, do operate the buttons while the watch is submerged. Case Integrity J-axis Cybeat Watch Manual
From the normal timekeeping screen, press the MODE button three times. The "Seconds" digits will begin flashing. It looks like you're looking for a described