**Product Specifications:**
**Brand:** CASIO
**Model:** GBM-2100
**Bluetooth Connectivity:** Equipped with Bluetooth connectivity for more accurate and reliable timekeeping.
**Solar Power:** Converts sunlight or even weak light sources into electricity to ensure the normal operation of all watch functions.
**G-SHOCK Features:** High-brightness dual LED lighting, TOUGH SOLAR technology.
**Design:** Striking metal wristband crafted through forging, cutting, and polishing processes. Brushed finish on the top of the bezel and polished finish on the side for a dazzling shine.
**Color Options:** Classic silver-black, dynamic black and white, refreshing light blue, unique dark green.
**Materials:**
- **Strap:** Resin
- **Clasp:** Metal
- **Crystal:** Mineral glass
**Movement:** Quartz
**Case Diameter:** 49.3mm (vertical), 44.4mm (horizontal)
**Case Thickness:** 11.9mm
**Water Resistance:** 200m
**Weight:** 72g
**Additional Features:**
- Shockproof
- 200 Meters Waterproof
- High-brightness LED lighting
- Stopwatch (1/100 sec)
- Countdown timer
- Low battery alarm
- Full auto-calendar
- Daily alarm
- Bluetooth connectivity
- Luminous hands
- Power display
- Button sound on/off
- Energy-saving function
- World time (38 cities)
- Pointer evasion function
- 12/24-hour time format
**Packaging:** Includes watch, watch box, user manual, warranty card. Packaging and user manual may vary by batch and model.
**Maintenance:** Avoid using the watch in hot baths, saunas, or environments with large temperature changes. Do not operate the watch buttons or adjust the crown while in water.
**Water Resistance Tips:**
- 50m: Suitable for activities such as splashing, rain, car washing, cold water showers, surface swimming.
- 100m: Suitable for swimming and snorkeling.
- 200m: Suitable for diving (depth rating depends on the model).
**Repair Centers:** Official CASIO repair centers can provide maintenance services. Contact customer service for details.
**Warranty:** Refer to the warranty card provided by CASIO for warranty information.