1. Product Overview
The G-Shock Casio G-Steel Solar Connected Watch, model GBM2100-1A, combines robust shock-resistant construction with advanced features. It boasts a unique metallic watch face achieved through vapor deposition and a phosphorescent finish for enhanced readability in low light. This timepiece offers smartphone connectivity via Bluetooth and utilizes Casio's Tough Solar technology for energy efficiency.
Product Images

Front view of the G-Shock GBM2100-1A, showcasing its metallic green dial and octagonal stainless steel bezel.

Side profile of the watch, highlighting its slim design and button layout.

Rear view of the watch, displaying the stainless steel case back with model information and the quick-release pins for the strap.

Angled perspective of the watch, showing the interplay of the metallic bezel and the green dial.

A size guide for men's watches, providing visual comparisons of watch diameters (38mm, 42mm, 46mm, 50mm) against a U.S. Quarter for both round and square watch faces.
2. Setup
2.1 Initial Setup
Upon receiving your new G-Shock watch, carefully remove all protective plastic films from the watch face, case, and strap. Ensure no residue remains.
2.2 Smartphone Connection (Bluetooth)
The GBM2100-1A can be wirelessly connected to a compatible smartphone or tablet via Bluetooth for enhanced functionality and ease of use. This connection allows for automatic time synchronization, simplified setting adjustments, and convenient world time checks.
- Download the Casio Watches App: Search for and download the official "Casio Watches" application from your smartphone's app store (available for iOS and Android).
- Enable Bluetooth: Ensure Bluetooth is enabled on your smartphone.
- Open the App and Follow Prompts: Launch the Casio Watches app and follow the on-screen instructions to pair your GBM2100-1A watch. The app will guide you through the pairing process, which typically involves pressing a specific button on the watch to activate its Bluetooth pairing mode.
- Automatic Time Sync: Once paired, the watch will automatically synchronize its time with your smartphone, ensuring accurate timekeeping, including adjustments for daylight saving.
- Adjust Settings: Use the app to easily adjust various watch settings, such as alarms, timers, and world time cities, without needing to manually operate the watch buttons.
3. Operating Instructions
3.1 Basic Timekeeping
The watch features both analog hands and a digital display for timekeeping. The analog hands provide a traditional time display, while the digital display offers additional information and access to various functions.
3.2 Tough Solar Power
Your G-Steel watch is equipped with Casio's Tough Solar technology. This means the watch is powered by light, converting both natural and artificial light into energy. This energy is stored in a rechargeable battery, eliminating the need for frequent battery replacements and ensuring continuous operation.
- Charging: Expose the watch face to light regularly to maintain a sufficient charge.
- Power Saving: The watch includes energy-saving features that automatically conserve power when the watch is left in the dark for extended periods.
3.3 Key Features
- World Time: Access multiple time zones, ideal for frequent travelers.
- Stopwatch: Precise timing for various activities.
- Timer: Countdown timer function.
- Alarm: Set daily alarms.
- Double LED Light: Ensures clear visibility of both analog and digital displays in the dark.
- Calendar: Automatic calendar display.
- High Accuracy: Maintains very accurate timekeeping.
4. Maintenance
- Cleaning: Regularly wipe the watch case and strap with a soft, dry cloth to remove dirt and sweat. For the resin strap, a mild soap solution and water can be used, followed by thorough rinsing and drying.
- Water Resistance: The watch is water-resistant up to 200 meters. This makes it suitable for swimming and showering, but avoid operating buttons underwater to prevent water ingress.
- Charging: To ensure optimal performance of the Tough Solar feature, expose the watch to bright light periodically. Avoid prolonged storage in dark places.
- Strap Replacement: The watch features quick-release pins for easy strap removal and replacement, allowing for customization or maintenance.
5. Troubleshooting
| Issue | Possible Cause / Solution |
|---|---|
| Watch not charging / low power. | Ensure the watch face is exposed to sufficient light. Avoid covering the watch face for extended periods. |
| Bluetooth connection issues. |
|
| Time is inaccurate. |
|
| Buttons are unresponsive. | Ensure the watch is not in a locked mode. If underwater, avoid pressing buttons. Allow the watch to dry completely if it was recently wet. |
6. Specifications
| Feature | Detail |
|---|---|
| Model Number | GBM2100-1A |
| Brand | Casio (G-Shock) |
| Product Dimensions | 4.33 x 3.78 x 3.31 inches |
| Item Weight | 6.4 ounces (approx. 72 grams) |
| Case Dimensions (H x W x D) | 49.3 x 44.4 x 11.9 mm |
| Water Resistance | 200 meters (20 Bar) |
| Power Source | Tough Solar (Solar Powered) |
| Connectivity | Bluetooth (Smartphone Link) |
| Clasp Type | Buckle |
| Display Type | Analog-Digital |
| Case Material | Stainless Steel (Bezel) |
| Strap Material | Resin |
7. Warranty and Support
This Casio G-Shock watch comes with a standard manufacturer's warranty. For detailed information regarding warranty coverage, terms, and conditions, please refer to the warranty card included with your product or visit the official Casio website.
For technical support, service, or further inquiries, please contact Casio customer service or visit their official support portal. Keep your proof of purchase for any warranty claims.
Note: Warranty terms may vary by region.