| | 1/100-second stopwatch |
| | Measuring capacity: 23:59'59.99" Measuring modes: Elapsed time, split time, 1st-2nd place times |
| | 12/24-hour format |
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| | Accuracy: ±15 seconds per month |
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| | Alarms |
| | 5 independent alarms (one-time or daily) |
| | Approx. battery life |
| | 5 years on CR2025 |
| | Full auto-calendar (to year 2099) |
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| | Button operation tone on/off |
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| | Countdown timer |
| | Measuring unit: 1/10 second Input range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments) |
| | Flash alert |
| | Flashes with buzzer that sounds for alarms, hourly time signal, countdown timer time up alarm, countdown timer progress beeper. |
| | Hourly time signal |
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| | LED Backlight (Auto Light Super Illuminator) |
| | A high-brightness diode is used to illuminate the face of the watch in one of variety of colors: blue, green, light blue, pink, yellow, or white, The Auto white feature illuminates the display when the watch is titled towards t face. |
| | Multi Time (4 different cities) |
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| | Regular timekeeping |
| | Hour, minute, second, pm, month, date, day |
| | Shock resistant (G-SHOCK) |
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| | World Time |
| | 31 time zones (48 cities + coordinated universal time), daylight saving on/off, Home city/World time city swapping |
| | Size of case / total weight |
| | GD-100MS...... 55.0 X 51.2 X 17.4 mm / 72 g |