Seiko S651 Instructions Manual page 7

TURNING ON/OFF OF THE AUTO ILLUMINATION
The display is illuminated for 2 seconds with each press of any of the buttons.
While the stopwatch or timer is counting, the display is illuminated for 2 seconds every
minute to signal the lapse of time.
B
TURNING ON/OFF OF THE HOURLY TIME SIGNAL AND BUTTON OPERATION
CONFIRMATION SOUND
Hourly time signal mark
B
Press and hold for 2 to 3 seconds in TIME/
CALENDAR mode.
D
With each press, the auto illumination is
alternately turned on and off.
D
B
Press to return to TIME/CALENDAR mode.
C
With each press in TIME/CALENDAR
C
mode, the hourly time signal and button
operation confirmation sound are alter-
nately turned on and off.
7