100 Meter water resistant. Electro-luminescent backlight. Full auto EL light, afterglow, Solar powered, Low-temperature resistant(14°F/-10°C). Digital compass, Measures and displays direction as one of 16 points. Measuring range: 0 to 359. Measuring unit: 1o. Bidirectional calibration and northerly calibration function. Altimeter Measuring range: -2,300 to 32,800 ft (-700 to 10,000 m). Measuring unit: 20 ft (5 m) Auto memory measurements (up to 41 sets of data, each including altitude, date, time) Relative altitude display. Cumulative total ascent memory, Maximum altitude memory, Altitude alarm, Changeover between feet(ft) and meters(m), 1-second stopwatch (coordinated with altimeter). Measuring capacity: 5 hours or 10 hours. Measuring modes: Elapsed time, split time, 1st-2nd place times, Barometer. Display range: 7.65 to 32.45 inHg (260 to 1,100 hPa/mb) Display unit: 0.05 inHg (1 hPa/mb) Atmospheric pressure tendency graph *Changeover between inHg and hPa. Thermometer: Display range: 14 to 140°F (-10 to 60°C) Display unit: 0.2°F (0.1°C) Changeover between Fahrenheit (°F) and elsius (°C)Duplex LCDDaily alarmHourly time signal, Low battery warning display, Power save function (Turns off the display when the watch is left in the dark). Auto-calendar (to year 2039) 12/24-hour formatRegular timekeeping: Hour, minutes, seconds, pm, year, month, date, day. Accuracy: ±15 seconds per month. Approximate battery life: 5 months on CTL1616 (Storage/Secondary battery). Size of case/total weight 57.0 X 52.0 X 14.8 mm / 77 g Casio Model Number PRG50T-7 / PRG50T / PRG50T-7V / PRG50T-7VDR