•  Shock Resistant   •  Magnetic Resistant   •  200 Meter Water Resistant   •  Auto LED Light with Afterglow   •  World Time   •  29 times zones (48 cities + UTC), daylight saving on/off, home city/world time swapping   •  4 Daily Alarms and 1 Snooze Alarm   •  Hourly Time Signal   •  1/1000 Second Stopwatch   •  Measuring capacity: 99:59'59.999"   •  Measuring modes: Elapsed time, lap time, split time   •  Others: Speed (0-1998 units/hour), Selection distance input (0.0-99.9)   •  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)   •  Other: Auto-repeat   •  Full auto-calendar (pre-programmed until the year 2099)   •  12/24 Hour Formats   •  Accuracy: ? 15 seconds per month   •  Battery: CR1220   •  Approx. battery life: 2 years   •  Module 5081   •  Size of case/total weight   •  GA100GBX 55.0 x 51.2 x 16.9mm / 75g