- Brand: Casio G-Shock
- Series: G-Steel
- Reference: GSTB100-1A
- Case / bezel material: Resin / Stainless steel
- Resin Band
- Screw Lock Crown
- Neobrite
- Shock Resistant
- Mineral Glass
- Black ion plated bezel
- 200-meter water resistance
- Tough Solar (Solar powered)
- LED light (Super Illuminator)
Afterglow - Mobile link (Wireless linking using Bluetooth®)
- Dual time (Home city time swapping)
- 1-second stopwatch
Measuring capacity: 23:59'59
Measuring mode: split time
- Countdown timer
Measuring unit: 1 second
Countdown range: 24 hours
Countdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments) - Daily alarm
- Battery level indicator
- Power Saving (hands stop to save power when the watch is left in the dark)
- Full auto-calendar (to year 2099)
- Date display
- Day indicator
- Regular timekeeping
Analog: 3 hands (hour, minute (hand moves every 10 seconds), second),
3 dials (dual time hour and minute, dual time 24-hour, day) - Accuracy: ±15 seconds per month (with no mobile link function)
- Approx. battery operating time:
5 months on rechargeable battery (operation period with normal use without exposure to light after charge)
24 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)