These G-SHOCK models are designed and engineered for the rugged, 1/1000-second world of motor sports.Motor sports functions include a 1/1000-second stopwatch, stopwatch with auto-start function, lap memories, and much more. Oversized buttons allow easier operation. The 48-city World Time Mode includes cities where the world's biggest motor sports events are held and simultaneous access to the current times in three different time zone.A three-line display and peripheral graphic area creates the image of a high-tech meter panel, while a metal bezel add a hard, mechanical accent. LEDs flash from red to green in coordination with auto start timer operation, just like the lights at the start of a motorcycle.Mechanical designThe functional face design with its three-column digital display and graphic display on the LCD periphery projects a racing gauge image.This combines with the rigid-textured metal bezel to form a mechanical face with a distinctive motorsport perspective. 1/1000-second stopwatchA newly developed module has been adopted to support a high-precision 1/1000-second stopwatch function. Other useful functions for viewing motorsport and other events include an auto start function, total elapsed time/lap time display switch and lap time memory. The auto start function conducts a 5, 4, 3, 2, 1 countdown before the stopwatch engages. World TimeThe highly practical World Time feature displays the times in three different cities simultaneously. It's preset for 48 cities worldwide, with a focus on countries where major motor races are held. And, of course, summer time setting is selectable as well. LED indicatorThe built-in LED glows from red to green in conjunction with the stopwatch's auto start function as well as in the timer mode.Mineral GlassShock Resistant200-meter water resistanceCase / bezel material: Resin / Stainless steelResin BandElectro-luminescent backlightAuto light switch, afterglowFlash alert (LED indicator)Flashes with buzzer that sounds for alarms, hourly time signal, countdown timer time up alarm, countdown timer progress beeper, and stopwatch auto startWorld time28 time zones (48 cities); city code display; daylight saving on/off; 3 cities per screen1/1000-second stopwatchMeasuring capacity: Lap time (59'59.999''); Split time (9:59'59.999'')Measuring modes: Elapsed time, Lap /split timesMemoly capacity: Two elapsed time records, each with 100 entries (1 elapsed time entry, 99 lap /split time entries)Recorded data: Elapsed time, lap/split times, lap/split numbers, best lap time and number, measurement start month, day, timeOther: Auto-Start (pre-countdown for five seconds and automatic start of a stopwatch elapsed time operation)2 countdown timers (help you alternate between hand and easy pace for interval training.)Measuring unit: 1 secondInput range: 1 second to 99 hours, 59 minutes, 59 seconds (1-second, 1-minute and 1-hour increments)Other: Auto Repeat timing (Timer-to-timer, 5 repeats)5 multi-function* alarms5 independent multi-function* alarms (4 one-time alarms and 1 snooze alarm)*Four patterns (daily, once, weekend, weekday)Hourly time signal*Start and stop time specification. Three patterns (daily, weekend, weekday)Full auto-calendar (to year 2099)12/24-hour formatButton operation tone on/offRegular timekeeping: Hour, minutes, seconds, am/pm, year, month, date, dayOthers: Dual Time (can be assigned one of 48 city codes); week number; Dual Time Daylight Saving Time (summer time)/Standard Time; number of days elapsed since January 1; number of days remaining until December 31Accuracy: ±15 seconds per monthApprox. battery life: 5 years on CR2025Size of case: 52.3 X 45.9 X 14.6 mmTotal weight: 56 gEL:Blue Green