Casio G-Shock GLS-100 Watch: User Manual and International Warranty

This document provides comprehensive instructions and warranty information for the Casio G-Shock GLS-100 watch, Module No. 3402.

International Warranty Network

Casio maintains an international warranty network to provide service for G-Shock watches worldwide. The warranty card included with your watch is valid outside of Russia and Ukraine. Service within Russia and Ukraine is based on the manufacturer's regional warranty card. This section lists authorized service centers by country.

International Warranty Terms

Casio Computer Co., Ltd. guarantees that G-Shock watches will be repaired free of charge by a member of the Casio international warranty network under the following conditions:

1. Warranty service requires presentation of the completed warranty card and proof of purchase.
2. This warranty is valid for one year from the date of original purchase for malfunctions occurring under normal use according to the user manual. Repairs after this period will incur charges.
3. The warranty does not cover:
• Malfunctions due to improper, rough, or negligent handling.
• Malfunctions due to fire or other natural disasters.
• Malfunctions due to improper repairs or adjustments performed by non-authorized Casio service centers.
• Damage or wear to the case, band (strap), or battery.
• Failure to present proof of purchase when submitting for repair.
• Expiration of the warranty period.
4. For warranty repairs, pack the watch securely, including the warranty card, proof of purchase, and a description of the malfunction.
5. Casio and its warranty network members are not liable for loss, damage, or alteration of data or memory contents of the watch.
6. This warranty is the sole express or implied basis for warranty repair of Casio G-Shock watches outside of Russia and Ukraine.
7. Warranty services are provided only by members of the Casio international warranty network.
8. Warranty services are provided only to the original purchaser. Rights arising from this warranty supplement, but do not affect, the legal rights of the purchaser.

Water Resistance

Watch water resistance is classified by rating (I to V) according to their protection against water. Use the table below to determine the correct usage for your watch.

Notes:

• I: Watches are not water-resistant. Avoid all moisture.
• II WR (Water Resistant) means the model is waterproof according to ISO 2281. Brief contact with water will not cause problems.
• III With 5 Bar (50 meters) water resistance, the watch can withstand water pressure indicated by the value and can be used during showering and brief swimming.
• IV 10 Bar (100 meters) water resistance means the watch can be used during normal swimming and snorkeling.
• V 20 Bar (200 meters) water resistance means the watch can be used for scuba diving (except for depths requiring helium-oxygen mixture).

Care and Maintenance

• Do not attach the strap too tightly. Ensure a finger can pass between your wrist and the strap.
• To clean the watch and strap, use a dry soft cloth, or a soft cloth dampened with a water solution of mild neutral detergent. Never use volatile substances like gasoline, solvents, spray cleaners, etc.
• When not in use, store your watch in a dry place.
• Avoid exposing the watch to gasoline, cleaning solvents, spray aerosols, adhesives, paint, etc. Chemical reactions caused by these materials can damage gaskets, the case, and the watch's finish.
• Some models feature screen-printed designs on the strap. Clean these straps carefully to avoid damaging the designs.
• For watches with plastic straps: A white powdery substance may appear on the strap. This substance is harmless and can be easily removed by wiping with a cloth. Sweat or moisture on plastic straps, or storage in humid conditions, can cause damage, tearing, or cracking. To ensure a long life for plastic straps, wipe them 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 fade. Prolonged contact with moisture can also cause fading. Wipe off any moisture as soon as possible. Prolonged contact with other wet surfaces can cause discoloration. Ensure fluorescent surfaces are dry and avoid contact with other surfaces. Strong friction of fluorescent surfaces against other surfaces can transfer the fluorescent paint.

General Operation

Press button C to switch between modes. Press button B to illuminate the display in any mode.

• Current Time Mode: For setting and viewing the current time and date.
• Stopwatch Mode (ST1, ST2): For measuring elapsed time, split times, and recording two finish times. ST1 also supports an auto-start function.
• Countdown Timer Mode: For setting a countdown from 1 minute to 24 hours.
• Alarm Mode: For setting up to 5 independent alarms and an hourly time signal.
• World Time Mode: Displays the current time in 48 cities (29 time zones) worldwide.

Setting the Current Time and Date

Time for city codes (time zones) in the Current Time and World Time modes is set relative to Coordinated Universal Time (UTC). Before setting the time and date, set the UTC offset.

1. In Current Time Mode, press and hold button A until the seconds display flashes, indicating the setting mode.
2. Press button C to cycle through the parameters to set: Seconds, DST, UTC Offset, Hours, Minutes, Year, Month, Day.
3. When the parameter you want to change flashes, use buttons D or B to adjust its value.
4. Press button A to exit setting mode.

Setting Daylight Saving Time (DST):

1. In Current Time Mode, press and hold button A until the seconds display flashes.
2. Press button C to advance to the DST setting screen.
3. Press button D to turn DST ON (indicator ON) or OFF (indicator OFF).
4. Press button A to exit setting mode. The DST indicator will appear on the screen when DST is active.

Switching Between 12-Hour and 24-Hour Formats:

In Current Time Mode, press button D to toggle between 12-hour and 24-hour time display. The 'P' indicator shows PM for the 12-hour format.

Stopwatch Mode (ST1 & ST2)

The watch features two stopwatch modes, ST1 and ST2. You can measure elapsed time, split times, and record two different finish times. The ST1 mode includes an auto-start function.

Measurement limit: 999 hours, 59 minutes, 59.99 seconds. The stopwatch will reset to zero and continue counting if this limit is reached.

Measuring Elapsed Time:

• Press D to start.
• Press D to stop.
• Press B to reset.

Measuring Split Times:

• Press D to start.
• Press B to display split time (SPL indicator appears).
• Press B again to cancel split time display and resume total time.
• Press D to stop.
• Press B to reset.

Auto-Start (ST1 only):

When auto-start is activated, the watch initiates a 5-second countdown before the stopwatch begins. A beep sounds for the last three seconds of the countdown. Press button A in the stopwatch ST1 initial screen to activate auto-start (-5" indicator appears). Press D to start the countdown.

Countdown Timer Mode

You can set the countdown timer from 1 minute to 24 hours. A beep sounds when the countdown reaches zero. Features include auto-repeat and progress signals.

Setting the Countdown Timer:

1. In Countdown Timer Mode, press and hold button A until the hour value flashes to enter setting mode.
2. Press C to select the parameter to set: Hours, Minutes, Auto-Repeat, Progress Signals.
3. When the parameter flashes, use buttons D or B to adjust its value.
4. Press A to exit setting mode.

Auto-Repeat: When enabled, the timer automatically restarts when it reaches zero. When disabled, the countdown stops at zero.

Progress Signals: Beep signals can be set for different stages of the countdown. For example, signals sound at 5-minute intervals in the last 30 seconds, and every second in the last 10 seconds.

Alarm Mode

Set up to 5 independent alarms with time (hour, minute) and date (day, month). An hourly time signal can also be set.

Alarm Types:

• Daily Alarm (AL1-AL4): Set alarm time. Beeps daily at the set time.
• Date Alarm (AL1-AL4): Set alarm date (month, day) and time. Beeps on the specified date and time.
• Monthly Alarm (AL1-AL4): Set alarm month and time. Beeps daily within the set month at the specified time.
• Snooze Alarm (SNZ): Alarm beeps every 5 minutes for a total of 7 times or until turned off.
• Hourly Time Signal (SIG): Beeps at the top of the hour.

Setting an Alarm:

1. In Alarm Mode, use buttons D and B to select the alarm indicator (AL1-AL4, SNZ, SIG).
2. Press and hold button A until the hour value flashes to enter setting mode. This also activates the alarm.
3. Press C to select the parameter to set: Hours, Minutes, Month, Day.
4. When the parameter flashes, use buttons D or B to adjust its value.
5. Press A to exit setting mode.

Alarm Functionality: Alarms sound for 20 seconds at the set time and date, regardless of the current mode. Snooze alarms repeat every 5 minutes. Pressing any button stops the alarm.

Checking an Alarm: In Alarm Mode, press and hold button D to sound the alarm.

Enabling/Disabling Alarms: In Alarm Mode, press button D to select the alarm, then press button A to toggle the alarm ON or OFF.

World Time Mode

Displays the current time in 48 cities (29 time zones) worldwide. Operations are performed in World Time Mode.

Displaying Time for Another City: In World Time Mode, press button D to cycle through city codes from east to west.

Setting Standard/Daylight Time for a City:

1. In World Time Mode, use button D to select the city code for which you want to set standard/daylight time.
2. Press and hold button A to toggle DST ON (DST indicator appears) or OFF (DST indicator disappears).

Note: DST settings affect only the selected city code.

Backlight

The watch uses an electro-luminescent panel for illumination, making it easy to read in the dark. It features an auto-light function that activates when you tilt your wrist towards you.

Turning on the Backlight: In any mode, press button B to illuminate the display. The backlight duration can be set to 3 or 5 seconds.

Setting Backlight Duration:

1. In Current Time Mode, press and hold button A until the seconds display flashes.
2. Press button B to select 3 seconds (indicator appears) or 5 seconds (indicator appears).
3. Press button A to exit setting mode.

Auto-Light: When enabled, the watch face automatically illuminates when your hand is tilted towards you (approx. 40° angle). Ensure the watch is worn on the outside of your wrist and your hand is parallel to the ground before tilting.

Enabling/Disabling Auto-Light: In Current Time Mode, press and hold button B for three seconds to toggle auto-light ON (indicator appears) or OFF (indicator disappears). The auto-light function automatically turns off after 6 hours to save battery.

Button Operation Sound

You can enable or disable the sound that beeps when a button is pressed. Other alarms (hourly chime, alarms, stopwatch, countdown timer) will still sound according to their settings.

Enabling/Disabling Button Sound: In any mode (except setting modes), press and hold button C to toggle the sound ON (MUTE indicator disappears) or OFF (MUTE indicator appears).

Reference Information

This section provides technical details and precautions.

Graphical Areas:

The watch display has three graphical areas: A, B, and C. The information displayed depends on the current mode.

• Area A: Displays seconds for Current Time, World Time, Stopwatch (ST1/ST2), and Countdown Timer. No information is displayed for Alarm Mode.
• Area B: Displays minutes for Stopwatch ST1 (each segment represents 5 minutes).
• Area C: Displays minutes for Stopwatch ST2 (each segment represents 5 minutes).

Initial Screens:

When entering World Time or Alarm Mode, the watch displays the data viewed before exiting that mode.

Timekeeping Accuracy:

Accuracy at normal temperature: ±30 seconds per month. Features include 12/24-hour format, automatic calendar programmed from 2000 to 2099, and DST/standard time settings.

UTC (Coordinated Universal Time):

UTC is the global scientific standard for time measurement, based on highly accurate atomic clocks. Time zones are set relative to UTC.

City Code Table

This table lists world cities and their corresponding UTC offsets. Note that time zone rules and DST adjustments can vary by country.

*Note: UTC offset for Caracas (CCS) changed from -04:00 to -04:30 in June 2012. **UTC offset for Moscow (MOW) changed from +03:00 to +04:00 in June 2012. Time zone rules and DST may vary by country. Russia abolished DST in June 2011.

Technical Specifications

• Accuracy: ±30 seconds per month at normal temperature.
• Timekeeping: Hours, minutes, seconds, AM/PM, month, day, day of the week. 12/24-hour format. Fully automatic calendar (2000-2099). DST/Standard time.
• Stopwatch ST1: 1/100 sec. unit, 999:59'59.99" measurement limit. Elapsed time, split times, two finish times. Auto-start function.
• Stopwatch ST2: 1/100 sec. unit, 999:59'59.99" measurement limit. Elapsed time, split times, two finish times.
• Countdown Timer: 1 sec. unit. 1 minute to 24 hours. Auto-repeat, progress signals.
• Alarm: 5 multi-function alarms (1 with snooze). Hourly time signal. Types: Daily, Date, Monthly, Snooze.
• World Time: 48 cities (29 time zones). DST/Standard time.
• Backlight: Electro-luminescent panel. 3 or 5 sec. illumination duration. Auto-light function.
• Other: Button operation sound (toggle on/off), light indicator.
• Power: One CR2025 lithium battery.
• Approx. Battery Life: 3 years (with specific usage conditions).

Precautions for Backlight Use

• Backlight is difficult to see in direct sunlight.
• Backlight automatically turns off when any alarm sounds.
• Frequent use of the backlight will drain the battery quickly.
• If wearing the watch on the inside of the wrist, the auto-light may activate frequently. Turn off auto-light in such situations to save battery.
• The backlight will not activate if the dial is tilted more than 15° from horizontal. Ensure your hand is parallel to the ground.
• The backlight turns off after a set time (3 or 5 sec.), even if the watch is held perpendicular to the ground.
• Static electricity or magnetic fields may interfere with auto-light function. If it doesn't activate, return the watch to a horizontal position, then tilt it towards you again. If this fails, lower your arm along your body and try again.
• A faint clicking sound may be heard when tilting the watch; this is a mechanical sound of the auto-light and does not indicate malfunction.

Product Information

Product Name: Electronic / electro-mechanical quartz wristwatches (men's/women's)

Brand: CASIO

Manufacturer: CASIO COMPUTER Co., Ltd. (CASIO Computer Co., Ltd.)

Manufacturer Address: 1-6-2, Hon-machi 1-chome, Shibuya-ku, Tokyo 151-8543, Japan

Importer: LLC "Casio", 127015, Russia, Moscow, Butyrskaya St., Bldg. 77

Warranty Period: 1 year

Address of Authorized Organization for Claims: Indicated on the warranty card.