Use the Start/Stop (D) button to increase the flashing digits. To reset the seconds to zero, press D while they are flashing.
Press the button to navigate through the watch's primary functions in a loop: 1. Alarm Mode Casio G Shock Dw 6600 Instructions
You can activate a feature that flashes the screen backlight alongside the alarm or timer beeps. On the main timekeeping screen, press and hold the Start/Stop (D) button for about 2 seconds until the small flash icon appears on the display. Use the Start/Stop (D) button to increase the