**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 indoor lighting into energy to ensure the normal operation of the watch functions.
**G-SHOCK Features:** High-brightness dual LED illumination, TOUGH SOLAR technology.
**Design:** Striking metal wristband crafted through forging, cutting, and polishing processes. Brushed finish on the top of the bezel and mirror-polished finish on the side for a distinctive shine.
**Color Options:** Classic silver-black, dynamic black and white, refreshing light blue, unique dark green.
**Materials:** Resin wristband, metal buckle, mineral glass watch face.
**Movement:** Quartz movement.
**Case Diameter:** 49.3mm (vertical), 44.4mm (horizontal), 11.9mm thickness.
**Water Resistance:** 200 meters.
**Weight:** 72g.
**Additional Features:** Shockproof, high-brightness LED lighting, stopwatch, countdown timer, low battery alarm, full auto-calendar, daily alarm, world time for 38 cities, energy-saving function, 12/24-hour time format, solar-powered.
**Packaging:** Includes 1 watch, 1 watch box, 1 user manual, 1 warranty card. Packaging and 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 buttons or adjust the crown underwater.
**Repair Centers:** Official CASIO repair centers can provide maintenance services.
**Warranty:** Warranty card provided by CASIO.
Please note that specific details may vary based on production batches and measurement methods. Refer to the actual product for accurate dimensions.