Casio G-Shock GA-100-1A1 – All-Black Analog-Digital Watch, 200m Water Resistance & Auto Light
Product Highlights
- Big, bold 55 mm case gives the GA-100 its heavy-duty look, finished in all black.
- Shock-resistant G-Shock build is made to take knocks and drops.
- Magnetic resistance keeps timekeeping steady around everyday magnets.
- 200-metre water resistance handles swimming and water sports.
- Auto light switch turns on the amber LED when you tilt the watch towards you.
- 1/1000-second stopwatch measures up to 99:59’59.999″ and can show speed over a set distance.
- World time covers 29 time zones (48 cities plus UTC), with home and world city swapping.
- Countdown timer and 5 daily alarms (one with snooze) keep you on schedule.
- Full auto-calendar runs to the year 2099, with a choice of 12 or 24-hour format.
- Battery life of about 2 years (CR1220), with accuracy of ±15 seconds a month.
Technical Specifications
- Brand: Casio
- Collection: G-Shock
- Model: GA-100-1A1
- Display: Analog-digital
- Colour: All black
- Case: Resin
- Case Size: 55 × 51.2 × 16.9 mm
- Glass: Mineral glass
- Band: Resin strap
- Band Fits: 145 to 215 mm wrists
- Shock Resistance: Yes
- Magnetic Resistance: Yes
- Water Resistance: 200 m (20 bar)
- Light: LED with auto light switch and afterglow
- World Time: 29 time zones (48 cities + UTC)
- Stopwatch: 1/1000 second, up to 99:59’59.999″
- Timer: Countdown, up to 24 hours, auto-repeat
- Alarm: 5 daily alarms (1 with snooze), hourly time signal
- Calendar: Full auto-calendar to 2099
- Battery: CR1220, approx. 2 years
- Accuracy: ±15 seconds per month
- Weight: 70 g
What’s in the Box
- Casio G-Shock GA-100-1A1 watch
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