Casio 3251 Alarm, Dual Time, Countdown Timer, Stopwatch, Reference, Alarm Operation, Auto Display, Flash Alert, Button Operation Tone

Operation Guide 3165/3251

To turn Active Display on and off

1. In the Timekeeping Mode, hold down Auntil the

Alarm

seconds start to flash, which indicates the setting

screen.2. Press Cseven times to display the Active Display on/off screen.

	3. Press Dto toggle Active Display on (on) and off (OF).
	4. Press Ato exit the setting screen.
Active Display on indicator	• 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 Cseven times to display the Active Display on/off screen.
3.	Use D to turn off (OF) Active Display.

Alarm time (Hour : Minutes)

Mode indicator

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 for10 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.

	• 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 Ato 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.

To set an alarm time

1.In the Alarm Mode, hold down Auntil 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

Alarm on indicator

change it.

4. Press Ato 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 Dto 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

PM indicator

Dual time(Hour : Minutes)

Mode indicator

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 Auntil 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 Ato exit the setting screen.

Countdown Timer

Minutes	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
Mode indicator	C.

To set the countdown start time

In the Countdown Timer Mode, press Ato 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 Awill increase the countdown start time at high speed.

To perform a countdown timer operation

In the Countdown Timer Mode, press Dto 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 Dwhile a countdown operation is in progress to pause it. Press Dagain 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.

Seconds Minutes Seconds

Mode indicator 1/100 second

Screen when stopwatch elapsed time operation is stopped at 40 minutes, 01.45 seconds

•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

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 Band Dfor 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
	LEDs	it off.
(Display illumination)
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
Mute indicator
		In any mode (except when a setting screen is on the
		display), hold down Cto toggle the button operation tone
		on ( not displayed) and off ( displayed).

•Holding down Cto 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.

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