The Casio PRO TREK PRG-340-3DR is a green solar-powered outdoor digital watch engineered for hiking, climbing, trekking, and exploration. Its Triple Sensor system provides digital compass, altitude, barometric pressure, and temperature measurements, while the innovative duplex LCD uses separate display layers to provide larger, easier-to-read compass graphics. The case and bezel are made from bio-based resin, paired with a soft urethane bio-based resin band and mineral glass. A rotating direction bezel provides simple orientation memory, while 100-meter water resistance and low-temperature resistance down to -10°C / 14°F support demanding outdoor use. With Tough Solar power, world time, sunrise and sunset data, stopwatch, countdown timer, five daily alarms, and a white Super Illuminator LED backlight, the PRG-340-3DR delivers a comprehensive set of functions for outdoor navigation and everyday use.
Key Features
Green PRO TREK outdoor digital design
Tough Solar power
Triple Sensor technology
Digital compass
Altimeter
Barometer
Thermometer
Duplex LCD
Rotating direction bezel
Bio-based resin case and bezel
Soft urethane bio-based resin band
Mineral glass
100-meter / 10-bar water resistance
Low-temperature resistant to -10°C / 14°F
World time
Sunrise and sunset display
1/10-second stopwatch
24-hour countdown timer
5 daily alarms, including 1 snooze alarm
Hourly time signal
White LED Super Illuminator
Full auto-calendar through 2099
Power Saving function
Battery level indicator
Accuracy of ±15 seconds per month
Compatible wrist size: 145–215 mm
Case & Bezel
Case and bezel material: Bio-based resin
Glass: Mineral Glass
Rotating direction bezel
Movable lug construction
Low-temperature resistant to -10°C / 14°F
Designed for outdoor navigation and exploration
Dial & Display
Digital display
Duplex LCD
Dual-layer LCD separates compass graphics from time and measurement information
Large compass display designed for improved legibility
Regular timekeeping displays:
Hour
Minute
Second
PM indicator
Month
Date
Day
12/24-hour time format
Full auto-calendar through 2099
Band
Soft urethane band
Material: Bio-based resin
Compatible wrist size: 145–215 mm
Designed for comfortable outdoor and everyday wear
Water Resistance
100-meter water resistance
10-bar water resistant
Triple Sensor
Digital Compass
Measures and displays direction as 16 points
Measuring range: 0° to 359°
Measuring unit: 1°
60-second continuous measurement
Graphic direction pointer
Bidirectional calibration
Magnetic declination correction
Bearing memory
Altimeter
Measuring range: -700 to 10,000 m
Equivalent range: -2,300 to 32,800 ft
Measuring unit:
1 m
5 ft
Manual memory measurements: Up to 30 records
Records altitude, date, and time
Auto log data:
High altitude
Low altitude
Cumulative ascent
Cumulative descent
Trek log data: Up to 14 records
Relative altitude readings: -3,000 to 3,000 m
Selectable measurement interval
Barometer
Display range: 260 to 1,100 hPa
Equivalent range: 7.65 to 32.45 inHg
Display unit:
1 hPa
0.05 inHg
Atmospheric pressure tendency graph
Displays the past 42 hours of readings
Atmospheric pressure differential graphic
Barometric pressure tendency information alarm
Thermometer
Display range: -10°C to 60°C
Equivalent range: 14°F to 140°F
Display unit:
0.1°C
0.2°F
Celsius/Fahrenheit switching
World Time
31 time zones
48 cities + Coordinated Universal Time (UTC)
Daylight saving time on/off
Sunrise & Sunset
Sunrise time display
Sunset time display
Sunrise and sunset information for a specified date
