Casio WVA-300/310 Watch User Manual

Important Information

Battery

The battery is installed at the factory and should be replaced immediately when signs of insufficient power appear (e.g., backlight not turning on, dim display) by an authorized CASIO dealer or distributor.

Water Resistance

Watches are classified by water resistance levels (from I to V). Consult the table below for correct operation.

Notes for relevant sections:

• Level I: Not water-resistant. Avoid all moisture.
• Level II: Do not pull out the crown if the watch is wet.
• Level III: Do not press watch buttons underwater.
• Level IV: If the watch is exposed to saltwater, rinse it thoroughly and dry it.
• Level V: The watch can be used for scuba diving (except for depths requiring a helium-oxygen mixture).

Note on Leather Straps: Some water-resistant watches have leather straps. Do not wear these watches while swimming or engaging in any activity where the strap may be submerged in water.

Care of Your Watch

• Never attempt to open the case or remove the back cover.
• The rubber gasket that protects the watch from water and dust should be replaced every 2-3 years.
• If moisture enters the watch, have it checked immediately by an authorized CASIO dealer or distributor.
• Do not expose the watch to extreme temperatures.
• While the watch is designed for normal use, avoid rough handling and dropping it.
• Do not fasten the strap too tightly. There should be space for a finger between your wrist and the strap.
• To clean the watch and strap, use a dry soft cloth or a soft cloth dampened with a mild neutral detergent solution. Never use volatile substances (e.g., gasoline, solvents, spray cleaners).
• When not in use, store the watch in a dry place.
• Avoid exposing the watch to gasoline, cleaning solvents, aerosol sprays, adhesives, paint, etc. Chemical reactions with these materials can damage gaskets, the case, and the watch's finish.
• Some models feature silk-screened graphics on the strap. Be careful when cleaning these straps to avoid damaging the designs.

For Watches with Plastic Straps:

• You may notice a white powdery substance on the strap. This substance is harmless to your skin or clothing and can be easily removed by wiping with a cloth.
• Sweat or moisture on a plastic strap, or storage in high humidity, can lead to damage, tearing, or cracking. To ensure a long service life for the plastic strap, wipe it clean of dirt and water with a soft cloth whenever possible.

For Watches with Fluorescent Cases and Straps:

• Prolonged exposure to direct sunlight can cause the fluorescent color to gradually fade.
• Prolonged contact with moisture can cause the fluorescent color to gradually fade. If any moisture gets on the watch surface, wipe it off as soon as possible.
• Prolonged contact with any other wet surface can cause discoloration of the fluorescent color. Ensure the fluorescent surface is free of moisture and avoid contact with other surfaces.
• Rubbing a surface with fluorescent paint against another surface can transfer the fluorescent paint to that surface.

Operating Modes

Press button 'C' ⚙️ to cycle through the different modes.

Current Time Mode

In Current Time Mode, you can view the current time and date, as well as the date of the last auto-calibration (by pressing button 'D' ⚙️).

Press button 'A' ⚙️ to switch between the current time and date display.

If you are in Western Europe, your watch can receive calibration signals, so manual time setting may not be necessary. If you are not in this region, you will need to set the time and date manually.

Setting Time and Date

1. In Current Time Mode, press button 'A' ⚙️. The auto-calibration signal indicator will flash.

2. Press button 'C' ⚙️ to cycle through the following settings: Auto-calibration signal → City Code → DST (Daylight Saving Time) → 12/24 Hour Format → Seconds → Hours → Minutes → Year → Month → Day → Sleep Mode → Auto-calibration signal.

3. While the seconds digits are flashing, press button 'D' ⚙️ to reset the seconds to '00'. If button 'D' is pressed when the seconds are between '30' and '59', the seconds will reset to '00' and one minute will be added. If seconds are between '00' and '29', the minutes will remain unchanged.

4. To adjust other digits (except seconds), use button 'D' ⚙️ to increase the value and button 'B' ⚙️ to decrease it.

5. Use button 'D' ⚙️ to turn Daylight Saving Time (DST) 'ON' or 'OFF'.

6. During time/date settings, press button 'D' ⚙️ to switch between 12-hour and 24-hour formats. The 'P' indicator appears for PM in the 12-hour format; no indicator appears for AM. The '24' indicator appears for the 24-hour format.

7. Use button 'D' ⚙️ to enable or disable the auto-calibration signal.

8. Use buttons 'D' ⚙️ and 'B' ⚙️ to select the City Code.

9. Use button 'D' ⚙️ to turn Sleep Mode ON or OFF.

Holding down buttons allows for faster adjustment.

10. After completing time and date settings, press button 'A' ⚙️ to return to the Current Time Mode.

The day of the week is set automatically according to the date. The date can be set from January 1, 2000, to December 31, 2039.

Auto-Calibration

This watch can receive a calibration signal to automatically update its time.

The watch automatically receives the signal twice daily. Calibration occurs at 2:00 AM and 4:00 AM. Do not perform any settings during these times to avoid interfering with the process.

To enable auto-calibration:

1. In Current Time Mode, press button 'A' ⚙️ until the auto-calibration setting appears.

2. Press button 'D' ⚙️ to enable or disable auto-calibration.

3. Press button 'A' ⚙️ when finished.

If auto-calibration is disabled, you can manually receive the signal:

1. Position your watch horizontally with the 12 o'clock position pointing towards Frankfurt, Germany.

2. In Current Time Mode, press and hold button 'D' ⚙️ for approximately 2 seconds until an audible signal and the time display indicate reception.

3. The signal reception will take 4 to 11 minutes. Do not move the watch during this period.

4. After calibration, the display will show the date and time of calibration.

To stop the calibration process, press button 'D' ⚙️.

If the display shows 'ERR', the calibration failed. The watch will automatically return to Current Time Mode.

A calibration indicator on the display shows the possibility of successful calibration. A fully filled indicator means calibration should proceed without issues.

Pressing button 'D' ⚙️ allows switching between the last auto-calibration date/time and the Current Time Mode.

Analog Time Mode

The analog time (on the dial) automatically synchronizes with the digital time displayed. If the times do not match for any reason, adjust the analog time:

1. In Current Time Mode, press button 'C' ⚙️ five times to enter Analog Time Mode.

2. Press button 'A' ⚙️ to start adjustment. The watch hands should be stationary.

3. Use button 'D' ⚙️ to advance the hour and minute hands, and button 'B' ⚙️ to move them backward in 20-second increments.

Holding down buttons allows for faster hand movement.

4. After completing the adjustment, press button 'A' ⚙️.

Backlight

Press button 'B' ⚙️ in any mode to illuminate the display for two seconds.

• The backlight uses electro-luminescent (EL) elements, whose power decreases over time.
• A faint audible sound may be heard when the backlight is on; this is normal due to the vibrating EL elements.
• The backlight may be difficult to see in direct sunlight.
• Frequent use of the backlight shortens battery life.
• The backlight automatically turns off when an audible signal sounds.

Day Counter Mode

In Day Counter Mode, you can set up to 5 different countdown timers.

Upon entering this mode, the display shows the date from which the countdown begins. Pressing button 'A' ⚙️ allows you to view the number of days.

• If a '-' indicator appears next to the date, the set date is before the current date.
• Each timer can be assigned a specific text. You can use the default text or enter your own.

Use button 'D' ⚙️ to view all timer values.

Setting Timer Date and Text

1. In Day Counter Mode, press button 'D' ⚙️ to select the timer you wish to set.

2. Press button 'A' ⚙️ until the cursor flashes on the display.

Simultaneously pressing buttons 'B' ⚙️ and 'D' ⚙️ clears the entered text (displaying 'CLEAR') and sets the current time as the countdown start time.

3. Press button 'C' ⚙️ to cycle through the following settings: Text → Year → Month → Day → Text.

4. When the cursor is in the text area, use buttons 'D' ⚙️ or 'B' ⚙️ to select characters. Press button 'C' ⚙️ to move to the next character.

5. Use buttons 'B' ⚙️ and 'D' ⚙️ to change the selected value.

6. After completing settings, press button 'A' ⚙️.

The date can be set from January 1, 1940, to December 31, 2039.

Phone Book Mode

This mode allows you to store up to 20 names and phone numbers.

You can scroll through the stored entries on the display.

The watch comes with three pre-set entries: "FAMILY", "HOME", and "OFFICE", without phone numbers. You can change or delete these.

Entering Entries in Phone Book Mode

1. In Phone Book Mode, press button 'D' ⚙️ to scroll through entries until the first blank entry appears (indicated by '---').

If 'FULL' is displayed, the phone book memory is full, and you must delete an old entry to save a new one.

2. Press and hold button 'A' ⚙️; a cursor will appear in the text area.

3. Enter characters for the text part using buttons 'B' ⚙️ and 'D' ⚙️. Characters cycle through: [space] → 'A'-'Z' → '0'-'9' → '-' → '.' → '/' → ':' → [space].

4. After selecting a character, press button 'C' ⚙️ to move the cursor to the right.

5. Repeat steps 3 and 4 to enter the full name. You can enter up to 8 characters for the name.

6. After entering the name, press button 'C' ⚙️ to move the cursor to the number area.

The name field can contain 8 characters. When the cursor is at the 8th character of the name, moving right will take you to the first digit of the number. When the cursor is at the 12th character of the number, moving right with 'C' ⚙️ will return you to the first character of the name.

7. Enter characters for the number using buttons 'B' ⚙️ and 'D' ⚙️. Characters cycle through: '-' → '0'-'9' → [space] → '-'.

8. After selecting a character, press button 'C' ⚙️ to move the cursor to the right.

9. Repeat steps 7 and 8 to enter the full phone number. The phone number field can contain 12 characters.

10. After entering the data, press button 'A' ⚙️ to save the entry to memory.

After pressing 'A' ⚙️ to save, the display will show 'SORT' for a few seconds. Once sorting is complete, the watch returns to the data entry mode.

Viewing Entries

In Phone Book Mode, press button 'D' ⚙️ to scroll through entries. Holding button 'D' ⚙️ allows for faster scrolling.

Press button 'A' ⚙️ to switch between the name field and the phone number field.

Editing Entries in Phone Book Mode

1. In Phone Book Mode, scroll to the entry you wish to edit.

2. Press button 'A' ⚙️; a cursor will appear in the text area.

3. Use button 'C' ⚙️ to move the cursor to the character you want to change.

4. Change the character using buttons 'B' ⚙️ and 'D' ⚙️. (Refer to "Entering Entries in Phone Book Mode" for character details.)

5. After making changes, press button 'A' ⚙️ to save and return to Phone Book Mode.

Deleting Entries in Phone Book Mode

1. In Phone Book Mode, scroll to the entry you wish to delete.

2. Press button 'A' ⚙️; a cursor will appear in the text area.

3. Press and hold buttons 'B' ⚙️ and 'D' ⚙️ simultaneously to delete the entry.

The message 'CLR' indicates the entry has been deleted. The cursor will appear in the text area, ready for new input.

4. After completing the deletion, press button 'A' ⚙️ to return to Phone Book Mode.

Sound Signal Mode

You can set up to three daily sound signals. When the set time is reached, the sound signal will sound for 10 seconds. If the hourly signal is enabled, a short beep will sound at the start of each hour.

Setting Sound Signal Times

1. In Sound Signal Mode, press button 'D' ⚙️ to select the type of sound signal: Alarm1 → Alarm2 → Alarm3 → SIG (Hourly Signal) → Alarm1.

2. Press button 'A' ⚙️ to begin setting. The sound signal time setting mode will automatically be activated.

3. Press button 'C' ⚙️ to cycle through the values to be set: Hours → Minutes → Hours.

4. Use buttons 'D' ⚙️ and 'B' ⚙️ to adjust the values. Holding down buttons allows for faster adjustment.

When setting the sound signal time in 12-hour format, ensure you select the correct period (AM/PM).

4. After setting the hours and minutes, press button 'A' ⚙️ again to save the sound signal settings.

Enabling/Disabling Sound Signal and Hourly Signal

1. In Sound Signal Mode, press button 'D' ⚙️ to select the type of sound signal.

2. After selecting the signal, press button 'A' ⚙️ to enable it.

Checking Sound Signal Operation

Press and hold button 'D' ⚙️ in Sound Signal Mode to test the sound signal.

Stopwatch Mode

The Stopwatch Mode allows you to measure elapsed time, split times, and dual finish times.

The maximum measurement range is 23 hours, 59 minutes, and 59.99 seconds.

a) Measuring Split Times

▶️ (Start) → ⏹️ (Stop) → ▶️ (Restart) → ⏹️ (Stop) → ? (Reset)

b) Measuring Lap Times

▶️ (Start) → ? (Lap Time) → ▶️ (Resume) → ⏹️ (Stop) → ? (Reset)

c) Dual Finish

▶️ (Start) → ? (Split . First Finish) → ⏹️ (Second Finish. Display shows 1st finisher's time) → ? (Cancel Split. Display shows 2nd finisher's time) → ? (Reset)

Power Source

• This watch is equipped with a solar rechargeable battery and a replaceable battery, which stores energy from light. The solar battery does not require replacement, but its functions may weaken after prolonged use and it may need to be replaced.
• Avoid prolonged periods in dark environments and wear the watch so that sunlight directly hits the watch face.
• If you do not use the watch for an extended period, switch it to sleep mode to conserve battery power.

Signal Indicator (Battery Charge)

• If two segments are filled in the lower part of the display, the battery is fully charged and all functions are operating normally.
• If one segment is filled on the left side of the lower display, the battery charge is too low for normal function.
• If a segment is filled on the right side of the lower display, you have been using the backlight and sound signal functions too frequently, which may be depleting the battery charge.

Technical Specifications

• Accuracy: +-15 seconds per month under normal temperature conditions.
• Current Time Mode: Hours, minutes, seconds, AM/PM indicator, year, month, day, day of the week.
• Time Display Format: Switchable between 12-hour and 24-hour formats.
• Calendar: Auto-calendar from 2000 to 2039.
• Other: DST (Daylight Saving Time), City Code setting, World Time (28 cities/29 time zones).
• Calibration Signal: Auto-calibration (2:00, 4:00 AM), Manual calibration.
• Phone Book: 20 entries (Name up to 8 characters, Phone number up to 12 characters).
• Other: Auto-sorting, memory capacity indicator.
• Sound Signals: 3 daily alarms, hourly signal indicator.
• Day Counter Mode: 5 countdown timers (8 characters text and time/date for each).
• Date Range for Countdown: January 1, 1940 – December 31, 2039.
• Stopwatch:
• Unit of Measurement: 1/100 second.
• Maximum Measurement: 23 hours, 59 minutes, 59.99 seconds.
• Measurement Modes: Split times, lap times, dual finish.
• Other: Dual-dial analog display, backlight (electro-luminescent panel), sleep mode.
• Battery: One battery (CTL1616). Battery life is approximately 6 months based on 1.5 seconds of backlight use per day and 10 seconds of sound signal use per day, plus 2 calibration signal receptions per day.

Product Information