Introduction
This manual provides detailed instructions for the proper use and care of your Casio G-Shock GMD-S5600-1ER digital quartz watch. Please read this manual thoroughly to ensure optimal performance and longevity of your timepiece. The GMD-S5600-1ER is designed for durability and features a digital display, quartz movement, and 200-meter water resistance.

Figure 1: Front view of the Casio G-Shock GMD-S5600-1ER digital watch.
Setup and Initial Configuration
Button Functions
Your G-Shock watch features four primary buttons, typically located on the sides of the watch case. While exact labeling may vary, their general functions are as follows:
- ADJUST (Top Left): Used to enter and exit setting modes, and to confirm selections.
- MODE (Bottom Left): Cycles through different watch modes (Timekeeping, Alarm, Stopwatch, Timer).
- START/STOP (Top Right): Used to start/stop stopwatch or timer, and to change settings in setting modes.
- LIGHT (Bottom Right): Activates the backlight for illumination.

Figure 2: Close-up of the watch face showing button locations.
Setting the Time and Date
- In Timekeeping Mode, press and hold the ADJUST button until the city code starts to flash. This indicates the setting mode.
- Use the START/STOP button to cycle through the settings (City Code, DST, 12/24-hour format, Seconds, Hour, Minute, Year, Month, Day).
- Use the MODE button to change the flashing value.
- Once all settings are correct, press the ADJUST button to exit the setting mode.
Battery Information
The GMD-S5600-1ER watch is powered by 1 Lithium Metal battery (included). The battery provides long-lasting power for the watch's functions. When the display becomes dim or functions become erratic, it may be time to replace the battery. It is recommended to have battery replacement performed by a qualified watch technician to ensure water resistance integrity.
Operating the Watch
Mode Navigation
Press the MODE button to cycle through the watch's various functions:
- Timekeeping Mode: Displays current time, day, and date.
- Stopwatch Mode: Measures elapsed time.
- Timer Mode: Counts down from a preset time.
- Alarm Mode: Sets daily alarms.
Using the Stopwatch
- From Timekeeping Mode, press MODE until you reach Stopwatch Mode.
- Press START/STOP to start the stopwatch.
- Press START/STOP again to stop the stopwatch.
- Press ADJUST to reset the stopwatch to zero.
Setting the Alarm
- From Timekeeping Mode, press MODE until you reach Alarm Mode.
- Press and hold ADJUST until the alarm time starts to flash.
- Use START/STOP to select the hour or minute setting.
- Use MODE to change the flashing value.
- Press ADJUST to confirm and exit.
- To turn the alarm on/off, press START/STOP in Alarm Mode (without holding ADJUST).
Using the Backlight
Press the LIGHT button (bottom right) to illuminate the display in low-light conditions. The light will typically stay on for a few seconds.

Figure 3: The GMD-S5600-1ER watch worn on a wrist, demonstrating its size and fit.
Maintenance and Care
Cleaning Your Watch
To maintain the appearance of your watch, wipe it regularly with a soft, dry cloth. For stubborn dirt, use a soft cloth dampened with water and a mild soap, then wipe dry. Avoid using chemical cleaners, solvents, or abrasive materials, as these can damage the resin case and strap.
Water Resistance
Your GMD-S5600-1ER watch is water resistant to 200 meters (20 BAR). This means it is suitable for showering, swimming, and diving. However, avoid operating buttons while the watch is submerged in water or wet, as this can compromise the water resistance seals. After exposure to saltwater, rinse the watch with fresh water and wipe it dry.
Battery Replacement
When the battery needs replacement, it is highly recommended to take your watch to an authorized Casio service center or a reputable watch repair shop. Improper battery replacement can damage the watch and compromise its water resistance.
Troubleshooting
If you encounter issues with your watch, please refer to the following common problems and solutions:
- Display is blank or dim: The battery may be low or depleted. Replace the battery.
- Buttons are unresponsive: Ensure the watch is not in a locked mode (if applicable, though this model typically doesn't have a lock). Try pressing the buttons firmly. If the issue persists, a reset may be required (consult a service center).
- Time is incorrect: Re-adjust the time and date settings as described in the "Setting the Time and Date" section. Ensure the correct city code and DST settings are applied.
- Water inside the watch: Immediately stop using the watch and take it to an authorized service center. This indicates a breach in the water resistance.
For issues not covered here, please contact Casio customer support or an authorized service center.
Specifications
| Feature | Detail |
|---|---|
| Model Number | GMD-S5600-1ER |
| Display Type | Digital |
| Watch Movement Type | Quartz |
| Case Material | Resin |
| Band Material | Plastic (Resin) |
| Case Diameter | 41 Millimeters |
| Case Thickness | 11 Millimeters |
| Water Resistance Depth | 200 Meters (20 BAR) |
| Power Source | Battery Powered (1 Lithium Metal battery included) |
| Additional Features | Alarm, Chronograph, Light, Timer |
| Crystal Type | Mineral |
| Item Weight | 100 Grams |
Warranty Information
This Casio G-Shock watch is covered by a manufacturer's warranty. For specific details regarding the warranty period, coverage, and terms, please refer to the warranty card included with your product packaging or visit the official Casio website. Keep your proof of purchase for warranty claims.

Figure 4: The G-Shock GMD-S5600-1ER watch is typically packaged in a durable tin.
Customer Support
For further assistance, technical support, or service inquiries, please contact Casio customer support. You can find contact information and frequently asked questions on the official Casio website:
Official Casio Website: www.casio.com
Please have your watch model number (GMD-S5600-1ER) ready when contacting support.





