Description
Description: The GST‑B400BB‑1AJF represents the slimmest evolution of G‑STEEL heritage, merging premium metal and resin construction into an ultra‑compact 12.9 mm profile. This all‑black design marries minimalist aesthetics with full-featured Tough Solar charging and Bluetooth Mobile Link connectivity, delivering a refined timepiece suitable for both professional and casual environments. At just 80 g, it achieves exceptional comfort without compromising durability, shock resistance, or the advanced functionality that defines modern G‑SHOCK performance.
Key Specifications:
- Case size: 46.6 mm × 49.6 mm × 12.9 mm (H × W × D)
- Weight: ~80 g
- Case material: Resin with stainless‑steel back
- Bezel: Black ion‑plated stainless steel
- Band: Black resin, 145–215 mm adjustable
- Water resistance: 200 m (20 ATM)
- Movement: Quartz calibre 5657 (Tough Solar, Bluetooth Mobile Link)
- Power source: Tough Solar; approximately 5–7 months on minimal light, 18 months in power‑save mode
- Accuracy: ±30 s/month
- Display: Dual‑layer LCD, white LED backlight with auto illuminator
- Functions: Analog‑digital display, world time (38 cities), 1/100‑second stopwatch, countdown timer, 5 daily alarms, full‑auto calendar, 12/24‑hour display, day/date, seconds‑hand stop, power reserve indicator, hand‑shift feature
- Bluetooth: Mobile Link (auto time sync up to 4×/day, phone finder, reminders, activity log)
- Additional features: Carbon Core Guard shock protection, mineral glass, vibration alarm
- Origin: Japan (JDM domestic model)
- Warranty: 1 year
- JAN: 4549526350573
- Series: G‑STEEL GST‑B400 Series
Key Highlights: The GST‑B400BB‑1AJF stands as a landmark achievement in G‑STEEL refinement—delivering premium functionality in an unexpectedly slim, lightweight package. By miniaturizing internal components while maintaining Bluetooth and solar features with reduced power consumption, Casio has created a watch that appeals equally to urban professionals, G‑SHOCK devotees, and anyone seeking uncompromising toughness in an understated form. The all‑black colorway with ion‑plated bezel conveys sophisticated restraint; the 46.6 mm case suits diverse wrist sizes from youth to adults without overwhelming the frame. Tough Solar eliminates battery maintenance, while Bluetooth Mobile Link ensures seamless smartphone integration and atomic time accuracy. Carbon Core Guard engineering delivers legendary G‑SHOCK resilience in a refined silhouette. Owners consistently praise the sleek design, exceptional build quality, versatility across business and casual settings, ultralight comfort, and proven durability. The resin band reportedly excels in sweat resistance and long‑term durability. This is an accessible entry point for G‑STEEL newcomers and an inspired upgrade for longtime G‑SHOCK enthusiasts seeking modern elegance without compromise.