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Operation Guide 3165/3251
To turn Active Display on and off
1.In the Timekeeping Mode, hold down A until the
seconds start to flash, which indicates the setting
screen.
2.Press C seven times to display the Active Display
on/off screen.
3.Press D to toggle Active Display on (on) and off (OF).
4.Press A to exit the setting screen.
• The Active Display on indicator (ACT ON) is on the
display while Active Display is turned on.
• Displaying the setting screen while Style 6 is displayed
and turning off Active Display will change the display
style to Style 2 automatically.
To select a timekeeping display style
1. In the Timekeeping Mode, hold down A until the seconds start to flash. This is the
setting screen.
2. Press C seven times to display the Active Display on/off screen.
3. Use D to turn off (OF) Active Display.
• You cannot select the timekeeping display style while Active Display is turned on.
4. Press A to exit the setting screen.
5. In the Timekeeping Mode, press A to cycle through the available timekeeping
display styles (Style 1 through Style 5), until the one you want is displayed.
• Displaying the setting screen while Style 6 is displayed and turning off Active Display
will change the display style to Style 2 automatically.
Countdown Timer
The countdown timer can be set within a range of one to
60 minutes. An alarm will sound when the countdown
reaches zero.
• The initial factory default setting is one minute (01min).
• The countdown operation continues even if you exit the
Countdown Timer Mode.
• All of the operations in this section are performed in the
Countdown Timer Mode, which you enter by pressing
C.
To set the countdown start time
In the Countdown Timer Mode, press A to increase the countdown start time
(minutes).
• You can set the countdown start time within the range of one minute (01min) to 60
minutes (60min), in one-minute increments.
• Holding down A will increase the countdown start time at high speed.
To perform a countdown timer operation
In the Countdown Timer Mode, press D to start the countdown.
• When the countdown reaches zero, the alarm tone will sound for 10 seconds or until
you stop it by pressing any button. The countdown time will reset automatically to its
starting value after the alarm stops.
• In addition to the alarm tone, a Flash Alert operation will be performed when the
countdown reaches zero. The Flash Alert operation will continue for 5 seconds or
until you stop it by pressing any button.
• Press D while a countdown operation is in progress to pause it. Press D again to
resume the countdown.
• To completely stop a countdown operation, first pause it (by pressing D), and then
press A. This will return the countdown time to its starting value.
• The remaining minutes and seconds are counted down on the display until the final
minute of the countdown. Only the seconds are displayed during the final minute.
Stopwatch
The stopwatch measures elapsed time.
• The display range of the stopwatch is 59 minutes, 59.99 seconds.
• Elapsed time operations are performed internally at units of 1/100-second. When
you stop an elapsed time operation, the 1/100-second value will appear on the
display.
Mode indicator
Seconds
1/100 second
Seconds Minutes
• Only the seconds are displayed during the first 59 seconds of an elapsed time
operation. After that, both the minutes and seconds are displayed.
• The stopwatch continues to run, restarting from zero after it reaches its limit, until
you stop it.
• The stopwatch measurement operation continues even if you exit the Stopwatch
Mode.
• All of the operations in this section are performed in the Stopwatch Mode, which you
enter by pressing C.
To measure elapsed time with the stopwatch
Elapsed Time
Start Stop Re-start Stop
Clear
Mode indicator
Minutes
Screen when stopwatch elapsed time operation
is stopped at 40 minutes, 01.45 seconds
Mode indicator
Alarm time
(Hour : Minutes)
Alarm
When the daily alarm is turned on, the alarm tone will
sound when the alarm time is reached.
• All of the operations in this section are performed in the
Alarm Mode, which you enter by pressing C.
Alarm Operation
The alarm tone will sound at the preset time for
10 seconds, regardless of the mode the watch is in.
• Alarm operations are performed in accordance with the
Timekeeping Mode time.
• To stop the alarm tone after it starts to sound, press any
button.
• In addition to the alarm tone, a Flash Alert operation will
be performed whenever the alarm time is reached. The
Flash Alert operation will continue for 5 seconds or until
you stop it by pressing any button.
To set an alarm time
1.In the Alarm Mode, hold down A until the hour setting
of the alarm time starts to flash, which indicates the
setting screen.
• This will turn on the alarm automatically.
2.Press C to move the flashing between the hour and
minutes.
3.While a setting is flashing, use D (+) and B (–) to
change it.
4.Press A to exit the setting screen.
• With the 12-hour format, set the time correctly as a.m.
(no indicator) or p.m. (P indicator).
To turn an alarm on and off
In the Alarm Mode, press D to toggle it on ( displayed) and off ( not displayed).
• The alarm on indicator ( ) flashes while the alarm is sounding.
• The alarm on indicator (
) is displayed in all modes.
To test the alarm
In the Alarm Mode, hold down D to sound the alarm.
Dual Time
The Dual Time Mode lets you keep track of time in a
different time zone.
• In the Dual Time Mode, the seconds count is
synchronized with the seconds count of the
Timekeeping Mode.
To set the Dual Time
1.Press C to enter the Dual Time Mode.
2.In the Dual Time Mode, hold down A until the hour
setting starts to flash, which indicates the setting
screen.
3.Press C to move the flashing between the hour and
minutes.
4.While a setting is flashing, use D (+) and B (–) to
change it.
5.Press A to exit the setting screen.
Reference
This section contains more detailed and technical information about watch operation.
It also contains important precautions and notes about the various features and
functions of this watch.
Auto Display
Auto Display cycles automatically through the screens of
each mode.
To turn off Auto Display
Press any button except for B (which will illuminate the
display).
To turn on Auto Display
In the Timekeeping Mode, hold down B and D for about
two seconds.
• Note that Auto Display cannot be turned on while a
setting screen is on the display.
Flash Alert
While Flash Alert is turned on, a 5-second Flash Alert
operation (flashing LEDs) will be performed whenever an
alarm time is reached or when a countdown reaches zero.
This helps to alert you even in areas where surrounding
noise is too loud to hear the alarm tone.
• You can stop the Flash Alert operation and the alarm
tone by pressing any button.
• Note that Flash Alert is always enabled. You cannot turn
it off.
Button Operation Tone
The button operation tone will sound any time you press
one of the watch’s buttons. You can turn the button
operation tone on or off as desired.
• The daily alarm and countdown alarm tones continue to
sound even if you turn off the button operation tone.
To turn the button operation tone on and off
In any mode (except when a setting screen is on the
display), hold down C to toggle the button operation tone
on (
not displayed) and off ( displayed).
• Holding down C to turn the button operation tone on or off also causes the watch’s
current mode to change.
• The mute indicator is displayed in all modes when the button operation tone is
turned off.
Alarm on indicator
Mode indicator
PM indicator
Dual time
(Hour : Minutes)
Mute indicator
LEDs
(Display illumination)
Active Display on indicator