The G-Shock GST-B400BD-1A2DR is a premium G-STEEL model that blends rugged durability with modern metallic elegance. Featuring a striking blue dial, black ion-plated finish, and smart Bluetooth connectivity, this solar-powered watch is engineered for men who want top-tier performance with bold, refined styling. Its ultra-slim G-STEEL profile and advanced features make it ideal for both professional and outdoor use.
Features
- Powered by Tough Solar technology, ensuring consistent operation using natural or artificial light.
- Bluetooth Smartphone Link enables auto time adjustment, easy watch settings, reminders, and phone finder functionality via the CASIO WATCHES app.
- Shock-resistant Carbon Core Guard structure provides top-level durability while keeping the case slim.
- Double LED Super Illuminator lights both analog hands and digital display for superior readability.
- World Time with access to approximately 300 cities via the app for seamless global timekeeping.
- 1/100-second stopwatch, countdown timer, 5 daily alarms, and full auto-calendar support an active lifestyle.
- Neobrite luminous coating enhances nighttime visibility.
Specifications
- Case/Bezel Material: Resin / Stainless Steel (Black Ion Plated)
- Band: Stainless Steel (Black Ion Plated), One-touch 3-fold Clasp
- Water Resistance: 200 meters
- Glass: Mineral Glass
- Case Size: 46.9 × 49.6 × 12.9 mm
- Weight: 160 g
- Shock Resistant: Yes
- Structure: Carbon Core Guard
- Power Source: Tough Solar
- Battery Life: 7 months (normal use), 18 months (power save mode)
- Connectivity: Bluetooth Mobile Link with CASIO WATCHES app
- World Time: 38 time zones, auto DST, city swapping
- Stopwatch: 1/100-second (first 60 min), up to 23:59’59”
- Countdown Timer: 1 sec–60 min
- Alarms: 5 daily alarms + hourly signal
- Light: Double LED (White) Super Illuminator
- Calendar: Full auto-calendar (up to 2099)
- Accuracy: ±15 seconds per month (without mobile link)
- Display: Analog-Digital with hand shift function
- Additional Features: Battery level indicator, mute function, date/month swapping, 12/24-hour format






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