Product Overview
The Casio G-Shock GM-2110D-2B is an analog-digital combination timepiece, part of the G-STEEL series. It features a robust octagonal stainless-steel bezel and a durable metal band, offering a sophisticated yet tough aesthetic. The watch case is constructed from high-rigidity glass-fiber-reinforced fine resin, making it one of the slimmest G-SHOCK combination models at just 11.8 mm. This model is designed for versatility, suitable for both professional and casual environments.

Figure 1: Front view of the Casio G-Shock GM-2110D-2B watch, showcasing its octagonal bezel, navy blue dial, and stainless steel band.
Key Features
- Shock Resistant: Engineered to withstand impacts and vibrations, ensuring durability in various conditions.
- 200-meter Water Resistance: Suitable for swimming, snorkeling, and diving without scuba gear.
- Stainless Steel Band: Provides a secure and comfortable fit with a one-touch 3-fold clasp.
- Neobrite Luminous Hands: Allows for easy time reading in low-light conditions.
- World Time: Displays the current time in major cities and specific areas around the world.
- 5 Daily Alarms: Set up to five independent daily alarms.
- Stopwatch: 1/100-second stopwatch with measuring modes.
- Countdown Timer: For precise timing of events.
- Full Auto-Calendar (to year 2099): Automatically adjusts for different month lengths and leap years.
- Double LED Light: High-brightness illumination for both the analog and digital displays.
Setup and Initial Configuration
1. Time Zone and Date Setting
- In Timekeeping Mode, press and hold the ADJUST button (top left) until the city code starts to flash.
- Use the MODE button (bottom left) to cycle through settings: City Code, DST (Daylight Saving Time), 12/24-hour format, Seconds, Hour, Minute, Year, Month, Day.
- Use the START button (bottom right) and LIGHT button (top right) to change the flashing value.
- Once all settings are configured, press the ADJUST button to exit the setting mode.
2. Analog Hand Adjustment
If the analog hands do not match the digital time, they may need alignment. Refer to the detailed manual for specific steps, usually involving a dedicated hand alignment mode accessed by holding a combination of buttons.
3. Band Adjustment
The stainless steel band may require adjustment for a comfortable fit. This typically involves removing or adding links. It is recommended to have this procedure performed by a professional jeweler or watch repair service, as it may require specialized tools for the inner link pins. Improper adjustment can damage the band.

Figure 2: Side profile of the watch, illustrating its slim design and the placement of control buttons.
Operating Modes and Functions
The watch features multiple modes accessible via the MODE button (bottom left).
- Timekeeping Mode: Displays current time, day, and date. This is the default mode.
- World Time Mode: Shows the current time in 48 cities (31 time zones). Use the START button to cycle through city codes.
- Alarm Mode: Set and activate up to 5 daily alarms and an hourly time signal. Use START to select alarm number, ADJUST to enter setting, and START/LIGHT to change values.
- Stopwatch Mode: Measures elapsed time, split times, and two finishes. Press START to begin/stop, ADJUST for split/reset.
- Countdown Timer Mode: Functions as a countdown timer. Set the start time using ADJUST and START/LIGHT. Press START to begin/stop.
Illumination
Press the LIGHT button (top right) to illuminate the display. The watch features a double LED light for both the analog and digital sections.
Maintenance and Care
Water Resistance
The watch is rated for 200-meter water resistance. This means it is suitable for recreational scuba diving. However, avoid operating buttons while the watch is submerged in water to prevent water ingress.
Cleaning
Wipe the watch regularly with a soft, dry cloth to remove dirt and moisture. For the stainless steel band, a soft brush and mild soapy water can be used, followed by thorough rinsing and drying. Avoid using chemical cleaners or solvents.
Battery Replacement
The watch uses 2 LR44 batteries. When the display becomes dim or functions become erratic, it may be time for battery replacement. It is highly recommended to have battery replacement performed by an authorized Casio service center or a qualified watch technician to ensure proper sealing and maintain water resistance.

Figure 3: Rear view of the watch, highlighting the durable case back and water resistance rating.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Analog hands do not match digital time. | Hands are misaligned. | Perform analog hand home position correction. Refer to the detailed manual for specific steps. |
| Digital display is dim or blank. | Low battery power. | Replace batteries. It is recommended to have this done by a professional. |
| Watch band is too large/small. | Incorrect band size. | Adjust band links. Professional assistance is recommended due to specialized inner link pins. |
| Watch not responding to button presses. | Temporary malfunction or low battery. | Try pressing all buttons firmly. If issue persists, consider battery replacement or professional inspection. |
Specifications
| Feature | Detail |
|---|---|
| Model Number | GM-2110D-2B |
| Case Size (H x W x D) | 49.3 x 44.4 x 11.8 mm |
| Weight | Approximately 10.86 ounces (308 grams) |
| Case/Bezel Material | Resin / Stainless Steel |
| Band Material | Stainless Steel |
| Clasp Type | One-touch 3-fold Clasp |
| Water Resistance | 200 meters (20 BAR) |
| Power Supply | 2 x LR44 batteries (included) |
| Illumination | Double LED light (Super Illuminator) |
| Calendar | Full auto-calendar (to year 2099) |

Figure 4: General Men's Watches Size Guide for reference on wrist fit.
Warranty and Support
For warranty information, service, or technical support regarding your Casio G-Shock GM-2110D-2B watch, please refer to the warranty card included with your purchase or visit the official Casio website. Casio provides customer support and authorized service centers for repairs and genuine part replacements.
Official Casio Website: www.casio.com





