Casio Watch Function User Manual

General Precautions

Do not expose the watch to extreme temperatures. Although the watch is designed for normal use, avoid rough handling and do not drop it. Do not fasten the band too tightly; you should be able to fit a finger between your wrist and the band. Use a dry, soft cloth, or a soft cloth dampened with a water solution of mild neutral detergent to clean the watch and band. Never use volatile agents (such as gasoline, thinners, spray cleaners, etc.). Store your watch in a dry location when not in use. Avoid contact with gasoline, cleaning solvents, spray aerosols, adhesives, paints, etc., as chemical reactions caused by these materials will damage gaskets, case, and finish. Some watch bands have designs printed on them using silk-screening; be careful when cleaning such bands to avoid damaging the designs.

Important Information

Battery

The battery initially installed in the watch is discharged during factory testing and shipping. When you notice the display becoming faint, it is time to have the battery replaced by an authorized CASIO service center or dealer.

Water Resistance

For all types of watches: Do not press any buttons underwater; do not set the crown underwater; do not unscrew the crown underwater. If the watch is exposed to salt water, rinse it thoroughly and dry it with a soft cloth. Do not wear a watch with a leather band while swimming, and avoid prolonged contact of leather bands with water.

For watches with resin bands: You may notice a white powdery substance on the band. This substance is harmless to your skin or clothing and can be easily removed by wiping with a soft cloth. Sweat or moisture on a resin band, or storage in a humid environment, can lead to damage, breakage, or cracking of the band. To ensure the longest possible life for your resin band, wipe it clean of dirt and moisture with a soft cloth whenever possible.

For watches with fluorescent cases and bands: Prolonged exposure to direct sunlight can cause the fluorescent coloring to fade gradually. Prolonged contact with moisture can also cause the fluorescent coloring to fade gradually. Wipe off any moisture from the watch surface as soon as possible. Prolonged contact with any other wet surface can cause the fluorescent coloring to discolor. Check that moisture has been removed from the fluorescent surface and avoid contact with other surfaces.

Notes: Rubbing a surface with fluorescent paint strongly against another surface can transfer the fluorescent paint to that surface. CASIO COMPUTER CO., LTD. is not responsible for any damage or loss incurred by you or any third party arising from the use of this watch or its malfunction. Condensation may form on the inside of the glass due to sudden temperature changes; this is a normal physical phenomenon and not a defect.

Notes on Water Resistance:

1. Category I: Not water resistant. Avoid all contact with water.
2. Category II: WR (Water Resistant) means the watch is water resistant according to ISO 2281. Brief contact with water will not cause any problems.
3. Category III: With 5 BAR (50 meters) water resistance, the watch can withstand water pressure as indicated and can be used while showering and for short periods of swimming.
4. Category IV: Water resistance of 10 BAR (100 meters) means the watch can be used for normal swimming and snorkeling.
5. Category V: Water resistance of 20 BAR (200 meters) means the watch can be used for scuba diving (excluding diving that requires a helium-oxygen mixture).

Care of Your Watch

Never attempt to open the case or remove the back cover yourself. The rubber gasket that protects the watch from water and dust should be replaced every 2 to 3 years. If moisture enters the watch, have it checked immediately by your nearest dealer or CASIO distributor.

Overview of Operating Modes

The illustration shows the general appearance of the watch in the Current Time Mode. Pressing the 'C' button cycles through the modes in the following order: Current Time Mode → World Time Mode → Countdown Timer Mode → Stopwatch Mode → Alarm Mode → Analog Time Mode → Current Time Mode. Press the 'B' button in any mode to turn on the backlight.

Button Functions:

• A: Used for setting values, confirming settings, and enabling/disabling functions like DST or alarms.
• B: Used to decrease values during setting, and to turn on the backlight. Holding it down can speed up value changes.
• C: Used to cycle through different setting items or modes.
• D: Used to increase values during setting, cycle through display options, start/stop/reset timers and stopwatches, and test alarms.

Modules: 3358, 3368, 3798

Current Time Mode

Setting the Time and Date

1. Press and hold the 'A' button in the Current Time Mode. The seconds digits will flash.
2. Press the 'C' button to cycle through the items to be set: Seconds → DST (Daylight Saving Time) → City Code → Hour → Minute → 12/24 Hour Format → Year → Month → Day → Backlight Duration.
3. If you select the seconds digits (flashing), press the 'D' button to reset the seconds to 00. If you press 'D' when the seconds are between 30 and 59, the seconds will reset to 00 and 1 will be added to the minutes. If the seconds are between 00 and 29, the minutes will not change.
4. Use the 'B' and 'D' buttons to change the flashing digits.
5. Press the 'D' button to toggle between 12-hour and 24-hour formats. With the 12-hour format, 'P' indicates PM.
6. Use the 'D' and 'B' buttons to select a city code.
7. Use the 'D' button to toggle Daylight Saving Time (DST) ON/OFF.
8. Use the 'D' button to select the backlight duration: 1 second or 3 seconds. Holding down a button changes the value at high speed.

The day of the week is set automatically according to the date. The date can be set for the range January 1, 2000, to December 31, 2039. After setting the date and time, press the 'A' button.

Backlight

Press the 'B' button in any mode to turn on the backlight. The backlight of this watch uses EL (electro-luminescent) elements, whose brightness will fade after a long period of use. A sound may be heard from the watch while the backlight is on; this is due to the vibration of the EL element and does not indicate a malfunction. The backlight is difficult to see in direct sunlight. Frequent use of the backlight shortens the battery life. To select the backlight duration: 1 second or 3 seconds, press the 'D' button in the Current Time Mode.

Auto Backlight

You can turn the Auto Backlight function ON or OFF by pressing and holding the 'B' button for about 2 seconds in the Current Time Mode. The Auto Backlight function turns on automatically whenever you angle your wrist towards you at approximately a 40° angle. Do not use the Auto Backlight function in situations where it could be hazardous or distracting, such as while riding a motorcycle or bicycle.

Analog Time Mode

The analog time of this watch is synchronized with the digital time. Therefore, there is no need to set it separately. However, if the analog time does not match the digital time for any reason, perform the following setting procedure:

1. In the Analog Time Mode, press and hold the 'A' button.
2. Use the 'D' button to advance the analog time. Each press of 'D' advances the time by 20 seconds. Pressing 'B' while pressing 'D' advances the time at high speed. Release any button to stop the rapid advance.
3. After setting, press the 'A' button.

World Time Mode

This mode allows you to view the current time in any of 27 cities worldwide (29 time zones).

Viewing the Time in Another Time Zone

In the World Time Mode, press the 'D' button to select the city whose time you want to view. To toggle Daylight Saving Time (DST) for another city, select the city and press and hold the 'A' button. 'DST' will appear on the display next to the city name when DST is ON.

Countdown Timer Mode

The countdown timer can be set in a range of 1 to 60 minutes. When the countdown reaches zero, a long alarm sounds. The last 10 seconds of the countdown will sound a short beep every second. With Auto-repeat ON, the timer will sound an alarm and start counting down again from the starting time automatically, repeating up to 8 times.

You can also set an alarm for the countdown process. At the start of every fifth minute and 30 seconds before the end of the countdown, 4 short beeps will sound. Then, a beep will sound every second for the last 10 seconds. If the timer's starting time is 6 minutes or more, the alarm will sound every second for the last 10 seconds until the 5-minute mark. At the 5-minute mark, 4 short beeps will sound.

Setting the Timer

1. In the Countdown Timer Mode, press and hold the 'A' button while the starting time is displayed. The starting time digits will flash.
2. Press the 'C' button to cycle through the items to be set: Starting Time → Auto-repeat → Alarm.
3. Use the 'D' and 'B' buttons to set the starting time and auto-repeat settings. You can set the starting time from 1 to 60 minutes in 1-minute increments.
4. Use the 'D' button to toggle the alarm ON or OFF.
5. Use the 'D' button to toggle Auto-repeat ON or OFF.
6. After setting, press the 'A' button.

Stopwatch Mode

The Stopwatch Mode allows you to measure elapsed time, split times, and two finishes. The measurement range of the stopwatch is limited to 59 minutes 59.99 seconds.

• a) Measuring Elapsed Time: D (Start) → D (Stop) → D (Restart) → D (Stop) → A (Reset)
• b) Measuring Split Times: D (Start) → A (Split) → A (Continue) → D (Stop) → A (Reset)
• c) Measuring Two Finishes: D (Start) → A (Split. First finish time displayed.) → D (Second finish.) → A (Cancel split. Second finish time displayed.) → A (Reset)

Alarm Mode

You can set up to four different daily alarms. When an alarm time is reached, the alarm sounds for 20 seconds. If the Hourly Time Signal is ON, the watch will beep at the top of the hour. If the Snooze Alarm is ON, the alarm will repeat every five minutes, up to seven times.

Setting an Alarm

1. In the Alarm Mode, press the 'D' button to select an alarm (AL1, AL2, AL3, AL4), the snooze alarm (SNZ), or the Hourly Time Signal (SIG).
2. After selecting the alarm you want to set, press and hold the 'A' button. The hour digits will flash, indicating that they are selected for setting. The alarm is automatically turned ON at this point.
3. Press the 'C' button to cycle through the settings: Hour → Minute.
4. Use the 'D' button to increase the value and the 'B' button to decrease it. Holding down a button changes the value at high speed.

The alarm time format (12-hour and 24-hour) matches the format you select for the current time. When using the 12-hour format, be careful to set the time correctly for AM or PM. After setting, press the 'A' button to return to the Alarm Mode.

To Test the Alarm

In the Alarm Mode, press the 'D' button to test the alarm.

To Turn the Alarm ON and OFF

1. In the Alarm Mode, press the 'D' button to select the alarm you want to turn ON or OFF.
2. After selecting an alarm, press the 'A' button to turn it ON or OFF.

When any of the 4 alarms is turned ON, 'AL' is displayed. When the snooze alarm is turned ON, 'SNZ' is displayed. When the Hourly Time Signal is turned ON, 'SIG' is displayed.

Technical Specifications

Product Information