The GDF100-1A Watch This totally new design for G-Shock comes packed with altimeter, barometer and thermometer, plus a powerful collection of additional features. Its design has been carefully crafted to incorporate a number of basic elements that reflect G-Shocks unique individuality. Shock Resistant 200M Water Resistant LED Backlight (Super Illuminator) Altimeter Measuring range: -700 to 10,000m (-2,300 to 32,800ft) without reference altitude Measuring unit: 5m (20ft) Others: Reference altitude setting Barometer Display range: 260 to 1,100 hPa (7.65 to 32.45 inHg) Display unit: 1 hPa (0.05 inHg) Atmospheric pressure differential pointer Thermometer Display range: -10 to 60 C (14 to 140 F) Display unit: 0.1 C (0.2 F) World Time 31 times zones (48 cities), city code display, daylight saving onoff 5 Daily Alarms Hourly Time Signal 1100 second stopwatch Measuring capacity: 23:5959.99 Measuring modes: Elapsed time, split time, 1st-2nd place times Countdown Timer Measuring unit: 1 second Countdown range: 1 minute to 24 hours (1 hour increments and 1 minute increments) Full Auto Calendar (pre-programmed until the year 2099) 1224 Hour Formats Button tone operation onoff Accuracy: -15 seconds per month (with no signal calibration) Battery: CR2025 Approx. battery life: 5 years By G-SHOCK