Casio G-Shock G-8900 Watch

About This Manual

This document provides operating instructions and warranty information for the Casio G-Shock G-8900 watch.

International Warranty

Casio Computer Co., Ltd. provides an international warranty for Casio G-Shock watches. The international warranty card included with your watch is valid for free repair by members of the CASIO international warranty network outside of Russia, Belarus, Kazakhstan, and Ukraine. For service within these countries, a regional warranty certificate is used. The warranty is valid for one year from the date of purchase for defects arising from normal use. It does not cover damage from improper handling, fire, natural disasters, unauthorized repairs, normal wear and tear of the case/band/battery, or failure to present proof of purchase. Loss or damage to the watch or its data is not the responsibility of CASIO or its service network. This warranty is the sole express or implied basis for warranty service outside Russia and Ukraine and is provided only to the original purchaser.

A list of international CASIO G-SHOCK service network members is provided in the original document, detailing country, name, and telephone number.

Water Resistance

Watches are classified by water resistance levels (I to V) according to ISO 2281. Check your watch's rating to determine its suitability for use:

Notes: Level I watches are not water-resistant. Avoid any contact with moisture.

Details:

• Level II (Water Resistant) indicates water resistance according to ISO 2281; brief contact with water is not problematic.
• Level III (5 Bar/50 meters) watches can withstand the specified water pressure and are suitable for showering and brief swimming.
• Level IV (10 Bar/100 meters) watches are suitable for normal swimming and snorkeling.
• Level V (20 Bar/200 meters) watches are suitable for diving (excluding depths requiring helium-oxygen mixtures).

Care and Maintenance

General Care

• Do not attempt to open the case or remove the back cover yourself.
• The gasket that prevents water and dust ingress should be replaced every 2-3 years.
• If moisture enters the watch, have it checked immediately by a dealer or CASIO distributor.
• Avoid exposing the watch to extreme temperatures.
• Wear the watch carefully to avoid drops, even though it is designed for active daily use.
• Do not fasten the band too tightly; ensure a finger can fit between your wrist and the band.
• Clean the watch and band with a dry soft cloth or a soft cloth dampened with a mild neutral detergent solution. Never use volatile solvents like gasoline, thinners, or spray cleaners.
• Store the watch in a dry place when not in use.
• Avoid contact with gasoline, cleaning solvents, aerosol sprays, adhesives, paints, etc., as chemical reactions can damage gaskets, cases, and polish.
• Be cautious when cleaning bands with screen-printed graphics to avoid damaging the designs.
• For plastic bands, white powdery residue may appear, which is harmless and can be wiped off. Moisture or sweat on plastic bands, or storage in high humidity, can cause damage. Wipe them clean with a soft cloth when possible.
• For watches with fluorescent cases and bands, prolonged exposure to direct sunlight or moisture can cause the fluorescent color to fade. Wipe off any moisture promptly.
• Strong friction on fluorescent surfaces can transfer the color.
• Condensation may form on the inside of the glass in conditions of rapid temperature change; this is a normal physical phenomenon and not a defect.
• CASIO COMPUTER CO., LTD. is not responsible for any damage that may occur during use.

Operating Modes

General Mode Sequence

Pressing button 'C' cycles through modes: Timekeeping → World Time → Alarm → Countdown Timer → Stopwatch → Timekeeping.

Timekeeping Mode

Set the current time, date, and home city. You can also view time and date for three other cities. Press button 'D' to cycle through cities (T1-T4). Press button 'A' to cycle through day of week and date.

Setting Time and Date

1. In Timekeeping Mode, use button 'D' to select your home city (T1).
2. Press and hold button 'A' until the seconds display flashes, indicating the start of setting.
3. Press 'C' to cycle through settings: Seconds → DST → City Code → Hours → Minutes → 12/24 Hour Format → Year → Month → Day → Display Illumination Duration → Signal → Seconds.
4. To adjust seconds, press 'D' to reset to 00. If seconds are 30-59, minutes increment.
5. Use 'D' to increase and 'B' to decrease values for minutes, etc.
6. Press 'D' to toggle between 12/24 hour format. 'P' indicates PM.
7. Press 'D' to toggle Daylight Saving Time (DST) on/off.
8. Use 'B' and 'D' to select a city code.
9. Press 'D' to adjust illumination duration (1.5 or 3 seconds).
10. Press 'D' to toggle button beep sound on/off.
11. Hold button to change values faster. Day of week is set automatically with date. Year range: 2000-2099.
12. Press 'A' to return to Timekeeping Mode.

Display Illumination

• Press 'L' in any mode to activate illumination.
• Illumination turns off automatically when an alarm sounds.
• LED illumination brightness may decrease over time.
• A faint sound during illumination is normal vibration, not a malfunction.
• Illumination is difficult to see in direct sunlight.
• Frequent use of illumination reduces battery life.

Auto Illumination

• Activates automatically when the watch is tilted at a 40° angle towards the ground.
• Avoid using Auto Illumination when distraction is possible (e.g., while riding a motorcycle or bicycle).
• Press and hold 'L' for 3 seconds in Timekeeping Mode to enable/disable Auto Illumination.

Signal Sound

• When enabled, illumination activates automatically during alarms, hourly time signals, and countdown timer signals.

Setting Button Sound

• Press and hold 'C' for several seconds in any mode to toggle button beep sound on/off.

World Time Mode

• View time in 48 cities (31 time zones). World time is synchronized with current time.
• Press 'D' and 'B' simultaneously to switch to UTC.
• To set DST: Select city with 'D'/'B', then press 'A' to toggle DST on/off.

Switching Home/World Time

In World Time Mode, select a city using 'D'. Press and hold 'A' and 'B' simultaneously until a beep. This swaps the home city and selected world city times.

Alarm Mode

• Set up to five daily alarms. Alarms sound for 10 seconds.
• Alarms can be set as regular (daily at the same time) or daily.
• Hourly time signal: Two short beeps at the start of each hour.

Setting Alarms

1. In Alarm Mode, use 'D' to select alarm type: -1 to -5, or :00 (hourly signal).
2. Select alarm type, then press and hold 'A' until digits flash to activate the alarm.
3. Press 'C' to cycle through settings: Hours → Minutes → Alarm Type (Regular/Daily) → Hours.
4. Use 'D' to increase and 'B' to decrease values. Hold button for faster changes.
5. 12/24 hour format matches current time setting. Be mindful of AM/PM for 12-hour format.
6. Toggle regular/daily alarm: '1 - ON' and 'ON'.
7. Press 'A' to finish.
8. Test alarm sound by pressing 'D' in Alarm Mode.
9. Toggle alarm sound on/off: Select alarm type with 'D', then press 'A' to cycle through 'ALM OFF', 'ALM 1 - ON', 'ALM ON'.
10. Toggle hourly time signal: Select signal type with 'D', then press 'A' to toggle 'ON'/'OFF'.

Countdown Timer Mode

• Set timer from 1 second to 24 hours.
• A long beep sounds when the countdown reaches zero.

Setting the Timer

1. In Countdown Timer Mode, press and hold 'A' to set the start time (it will flash).
2. Press 'C' to cycle through settings: Hours → Minutes → Seconds → Hours.
3. Use 'D' to increase and 'B' to decrease values.
4. To set 24 hours, enter '0:00 00'.
5. Press 'A' to finish.

Using the Timer

1. Press 'D' in Timer Mode to start.
2. Press 'D' again to stop.
3. Press 'D' to resume.
4. Press 'B' after stopping to reset to the start time.

Stopwatch Mode

• Measures elapsed time, split times, and first/second place times. Maximum range: 23 hours, 59 minutes, 59.99 seconds.

Measuring Split Times

D (Start) → D (Stop) → D (Restart) → D (Stop) → B (Reset).

Measuring Split Times with Split Indicator

D (Start) → B (Split Time. SPL indicator) → B (Restart) → D (Stop) → B (Reset).

Dual Finish

D (Start) → B (Split. 1st Finisher Time) → D (Stop. 2nd Finisher Time) → B (Cancel Split. 2nd Finisher Time) → B (Reset).

Technical Specifications

• Accuracy: +-15 seconds per month at normal temperature.
• Timekeeping: Hours, minutes, seconds, year, month, day, day of week.
• Calendar System: Auto-calendar from 2000 to 2099.
• Other: 12/24 hour format.
• World Time: Current time in other time zones.
• Countdown Timer: Unit of measurement 1/10 second. Range: 1 second to 24 hours.
• Alarm Sound: Regular alarm, daily alarm, hourly time signal.
• Stopwatch: Maximum range 23 hours 59 minutes 59.99 seconds. Measurement modes: lap times, split times, dual finish.
• Other: LED backlight, auto illumination, adjustable illumination duration, button beep on/off, signal sound.
• Power Source: One CR2016 lithium battery.
• Battery Life: Approximately 3 years (based on 20 seconds alarm use per day and 1.5 seconds illumination use per day).

Product Information

• Name: Wrist electronic / electro-mechanical quartz watch (Men's/Women's)
• Brand: CASIO
• Manufacturer: CASIO COMPUTER Co., Ltd.
• Manufacturer Address: 1-6-2, Hon-machi 1-chome, Shibuya-ku, Tokyo 151-8543, Japan
• Importer: OOO "Kasio", 127015, Russia, Moscow, Butyrskaya st., bld. 77
• Warranty Period: 2 years
• Authorized Service Organization for Claims: Specified in the warranty card.

Note on Russian Time Changes

As of June 2011, Russia abolished daylight saving time. Federal Law "On Amendments to the Federal Law 'On Time Calculation'" adopted on July 21, 2014, changed time calculation, resulting in 11 time zones in Russia as of October 26, 2014, with most shifted back by one hour. Please consider this information when setting your watch.