CASIO
CASIO GA100-1A4 G-Shock watch 55 mm black red
An oversized analogue-digital sports watch with 200 m water resistance, 1/1000-second chronograph, world time for 48 cities, auto LED light and magnetic resistance
- StyleSports
- Series NameG Shock
- MaterialPlastic
- MovementQuartz
- ColorBlack
- ResizableNo
- X-Large 55 mm case makes a bold wrist presence
- 200 m water resistance suits serious surface water sports
- Anti-magnetic build protects timing in magnetic fields
- Auto LED light with afterglow keeps display readable at night
- World time covers 48 cities for multi-zone tracking
X-Large G-Shock for sport timing
The Casio GA100-1A4 is an analogue-digital sports watch with a 55 mm resin case and rubber band. Quartz movement powers a 1/1000-second chronograph, countdown timer, speed timer, world time for 48 cities, daily alarm with snooze, auto LED light with afterglow and day-date calendar. Water resistance is rated to 200 m (660 ft) for serious surface water sports.
Suits athletes needing stopwatch precision
The anti-magnetic, shock-resistant build serves runners, swimmers and outdoor users who want multiple timing functions on a large, high-contrast dial. Buyers who require a watch certified for scuba diving should look elsewhere, as the specification covers professional marine activity and surface sports only.
1/1000-second chronograph decides the fit
This resolution supports split-second lap measurement for interval training and competition timing. If your activity only needs minute-level tracking, a simpler model will cover the requirement.
Highlights
- X-Large 55 mm case makes a bold wrist presence
- 200 m water resistance suits serious surface water sports
- Anti-magnetic build protects timing in magnetic fields
- Auto LED light with afterglow keeps display readable at night
- World time covers 48 cities for multi-zone tracking
Specifications
| Brand | CASIO |
|---|---|
| Model | GA100-1A4 |
| Style | Sports |
| Series Name | G Shock |
| Material | Plastic |
| Movement | Quartz |
| Color | Black |
| Resizable | No |
| Adjustable | No |
| Metal Stamp | Resin |
| Stone | date |
| Stone Cut Quality | 200M |
| Shape | Round |
| Dial Color | Black |
| Dial Markers | Index |
| Display | Digital |
| Date | Date |
| Chronograph | Chronograph |
| Band Material | Rubber |
| Band Length | 8 |
| Band Width | 16.9 |
| Fastener | Buckle |
| Gender | Male |
| Age | Adult |
| Condition | 51.20 mm |
| Bezel | Fixed Bezel |
| Case Diameter | 51 |
| Case Material | Resin |
| Case Thickness | 51.20 mm |
| Crystal | Mineral |
| Water-Resistant | 200m |
| Special Features | Shock and Magnetic Resistant, Auto LED Light with Afterglow, World Time, 4 Daily Alarms, 1 Snooze Alarm, Hourly Time Signal, and Countdown Timer |
| Alarm | Yes |
| Altimeter | Mineral Crystal |
| Heart Rate Monitor | Fixed Bezel |
| Indications & Functions | Index |
| App-Enabled | Yes |
| Size/Dimensions | 51mm wide by 17mm thick |
Questions about this item
How often will the battery need replacing in the GA100-1A4?
The quartz movement runs on a standard button cell; typical life is several years, and a watchmaker can swap it in minutes when the display dims.
What stops the chronograph from running indefinitely?
The 1/1000-second chronograph and stopwatch draw extra current, so continuous timing will drain the cell faster than normal timekeeping.
How warm does the case get and how loud is the alarm after all-day wear?
The resin case stays near skin temperature, and the hourly signal plus daily alarm are audible beeps, not a speaker, so heat and noise remain minimal.
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