Casio Pro Trek Watch PRW3500-1D

Mineral Glass
200-meter water resistance
Case / bezel material: Resin / Stainless steel
Resin Band
LED backlight (Super Illuminator)
Full auto LED light, selectable illumination duration, afterglow
Solar powered
Low-temperature resistant (–10°C/14°F)
Time calibration signal reception
Auto receive up to six* times a day (remaining auto receives canceled as soon as one is successful)
*5 times a day for the Chinese calibration signal
Manual receive
The latest signal reception results
Time Calibration Signals
Station name: DCF77 (Mainflingen, Germany), Frequency: 77.5 kHz
Station name: MSF (Anthorn, England), Frequency: 60.0 kHz
Station name: WWVB (Fort Collins, United States), Frequency: 60.0 kHz
Station name: JJY (Fukushima, Fukuoka/Saga, Japan), Frequency: 40.0 kHz (Fukushima) / 60.0 kHz (Fukuoka/Saga)
Station name: BPC (Shangqiu City, Henan Province, China), Frequency: 68.5 kHz
Digital compass Measures and displays direction as one of 16 points
Measuring range: 0 to 359°, Measuring unit: 1°
60 seconds continuous measurement,Graphic direction pointer
Bidirectional calibration, Magnetic declination correction, Bearing memory
Altimeter Measuring range: –700 to 10,000 m (–2,300 to 32,800 ft.)
Measuring unit: 1 m (5 ft.)
Manual memory measurements (up to 30 records, each including altitude, date, time)
Auto log data (High/low altitudes, auto cumulative ascent and descent)
Trek log data (up to 14 records of high/low altitudes, auto cumulative ascent and descent of particular treks)
Others: Relative altitude readings (–3,000 to 3,000 m), Selectable measurement interval: 5 seconds or 2 minutes
*1 second for first 3 minutes only
*Changeover between meters (m) and feet (ft)
Barometer Display range: 260 to 1,100 hPa (7.65 to 32.45 inHg)
Display unit: 1 hPa (0.05 inHg)
Atmospheric pressure tendency graph(past 42 hours of readings)
Atmospheric pressure differential graphic
Barometric pressure tendency information alarm (beep and arrow indicates significant changes in pressure)
*Changeover between hPa and inHg
Thermometer Display range: –10 to 60°C (14 to 140°F)
Display unit: 0.1°C (0.2°F)
*Changeover between Celsius (°C) and Fahrenheit (°F)
World time 31 time zones (48 cities + coordinated universal time), daylight saving on/off
Sunrise, sunset time display
Sunrise time and sunset time for specific date, daylight pointers
1/10-second stopwatch Measuring capacity: 999:59'59.9''
Measuring modes: Elapsed time, split time, 1st-2nd place times
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)
5 daily alarms (with 1 snooze alarm)
Hourly time signal
Battery level indicator
Power Saving (display goes blank to save power when the watch is left in the dark)
Full auto-calendar (to year 2099)
12/24-hour format
Button operation tone on/off
Regular timekeeping: Hour, minute, second, pm, year, month, date, day
Accuracy: ±15 seconds per month (with no signal calibration)
Approx battery operating time:
7 months on rechargeable battery (operation period with normal use without exposure to light after charge)
23 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge) 
Size of case: 56.9 × 53.4 × 14.5 mm
Total weight: 89 g
LED:White