Wrist watch G-SHOCK GA-B2100-2AER — unisex, carbon/resin case, blue, 45.4×48.5×11.9 mm

G-SHOCK GA-B2100-2AER is a unisex wrist watch that combines the iconic octagonal GA-2100 form with modern functionality. The case uses a carbon core guard structure with carbon fiber–reinforced resin to provide strength, low weight and improved weather resistance while maintaining a compact profile (45.4 × 48.5 × 11.9 mm). This blue model adds Smartphone Link and Tough Solar energy to ensure accurate, low-maintenance timekeeping. The dual-layer dial construction and differentiated surface treatments on the dial and inset dial emphasize dimensionality and improve legibility. Super Illuminator double LED lighting ensures the display remains readable in low light conditions.

Advantages

The Carbon Core Guard construction offers a durable yet lightweight housing that protects the module from shocks and external impacts. Tough Solar charging paired with Smartphone Link keeps time more accurate and reduces the need for battery replacement. The compact dimensions and octagonal design keep the watch comfortable for everyday wear while the double LED Super Illuminator and clear dial layout support reliable readability in varied lighting. Water resistance to 20 bar enables use in wet conditions and casual aquatic activities.

Suitable for

• Everyday timekeeping and casual wear
• Outdoor activities and travel
• Users who want low-maintenance, solar-powered watches
• People needing shock-resistant and water-resistant timepieces

Key specifications

• Case material: carbon fiber–reinforced resin (Carbon Core Guard)
• Band/case color: blue
• Dimensions: 45.4 × 48.5 × 11.9 mm
• Water resistance: 20 bar
• Power system: Tough Solar (solar-powered)
• Lighting: double LED Super Illuminator
• Connectivity: Smartphone Link (Bluetooth)
• Functions: world time (38 cities), 1/100-second stopwatch, countdown timer, 5 daily alarms, hand shift feature

How to use

Wear the watch on the wrist and adjust the band for a secure fit. Keep the watch exposed periodically to indoor or outdoor light to allow the Tough Solar system to maintain charge. Use the smartphone app to connect via Bluetooth for automatic time adjustment and additional setting options. Use the mode button to cycle through functions such as world time, stopwatch and timer; use the hand shift feature when setting digital readouts to view the display more clearly. Activate the Super Illuminator light for improved visibility in dark environments.

Usage recommendations

For reliable performance, avoid prolonged exposure to extreme temperatures and strong magnetic fields. Rinse the watch with fresh water after extended exposure to salt water or chlorinated pools and dry thoroughly. Connect occasionally to the smartphone app to keep time calibration and settings up to date.