- Targeted Group: Men
- Brand: Casio
- Model Number: GA-100-1A1
- Type: Sports
- Watch Shape: Round
- Movement: Quartz
- Display Type: Analog-Digital
- Dial Window Material Type: Mineral Crystal
- Case Material: Resin
- Case Diameter: 51 mm
- Case Thickness: 17 mm
- Band Material: Rubber
- Band Color: Black
- Targeted Group: Men
- Brand: Casio
- Model Number: GA-100-1A1
- Type: Sports
- Watch Shape: Round
- Movement: Quartz
- Display Type: Analog-Digital
- Dial Window Material Type: Mineral Crystal
- Case Material: Resin
- Case Diameter: 51 mm
- Case Thickness: 17 mm
- Band Material: Rubber
- Band Color: Black
- Band Width: 18 mm
- Clasp: Tang Buckle
- Water Resistant Depth: 200 M
- Dial Color: Black
- Measuring Capacity: 99:59'59.999''
- Measuring Modes: Elapsed time, lap time, split time
- Others: Speed (0 to 1998 units / hour), Distance input (0.0 to 99.9)
- Measuring Unit: 1 second
- Input Range: 1 minute to 24 hours (1-minute increments and 1-hour increments)
- Other: Auto-repeat
- Analog: 2 Hands (hour, minute (hand moves every 20 seconds))
- Digital: Hour, minute, second, pm, month, date, day
- Accuracy: ±15 Seconds per month
- Approx.. Battery Life: 2 Years on CR1220
- Weight:70 g
- Details: Mach indicator (speed exceeding 1225 units / hour)
- Shock Resistant
- Magnetic Resistant
- Auto light switch, selectable illumination duration, afterglow
- 29 Time zones (48 cities coordinated universal time), daylight saving on/off, Home city / World time city swapping
- 5 independent daily alarms (4 one-time alarms and 1 snooze alarm)
- Hourly time signal
- Full auto-calendar (to year 2099)
- 12/24-hour format
- Regular timekeeping