Tough Solar Power Shock Resistant Triple G Resistant Tough Movement Auto hand home position correction 200M Water Resistant Neo-brite luminous hands and markers World Time 29 times zones (29 cities + UTC), city code display, daylight saving on/off, home city/world time swapping) Beeper Alarm 1/100 second chronograph Measuring capacity: 00:23'59.99" Measuring modes: Elapsed time, split time Full Auto-Calendar (pre-programmed until the year 2099) 12/24 Hour Formats Accuracy: +/- 15 seconds per month (with no signal calibration) Storage Battery: Solar Rechargeable Battery Low Battery Warning Power Saving Function Approx. Battery Life: 5 months on full charge (without further exposure to light) Size of case/total weight GW4000 52.9 x 50.4 x 15.6mm / 75g GW4000D 52.9 x 50.4 x 15.6mm / 152g