Get out into the great outdoors with a solar-powered PRO TREK featuring eco-friendly materials that care for the environment.
The PRO TREK line of authentic outdoor gear for nature lovers introduces the PRG-340, a timepiece that incorporates environmentally friendly biomass plastics* while delivering the same comfortable fit for your wrist. The case and urethane band are crafted from biomass plastics made with castor oil and the band from biomass plastics made with corn.

The duplex LCD lays out separate layers for the compass graphics and the clock functions, enabling a larger compass display for better legibility and easier navigation in a design that is both functional and beautiful. The rotating bezel makes it simple to record compass readings, and the Tough Solar charging system keeps the advanced functionality on the go.

Get out and explore with a gentler footprint!

* Biomass plastics are polymers produced using chemical or biological synthesis of materials sourced from plant matter or other renewable organic substances and are widely thought to help reduce environmental impact and promote the shift to a circular economy.
Specifications
Basic Information
Case size (L× W× H)
54.7 × 51.7 × 15.1 mm
Weight
54 g
Case and bezel material
Bio-based resin
Band
Soft urethane band (Bio-based resin)
Water resistance
100-meter water resistance
Environmental resistance
Low-temperature resistant (-10?/14?)
Power supply and battery life
Solar powered
Sensor feature
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 indicate significant changes in pressure)
*Changeover between hPa and inHg
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
Thermometer
Display range: -10 to 60? (14 to 140?)
Display unit: 0.1? (0.2?)
*Changeover between Celsius (?) and Fahrenheit (?)
Exterior
Glass
Mineral Glass
Bezel features
Direction Bezel
Compatible band size
145 to 215 mm
Watch Features
World time
World time
31 time zones (48 cities + coordinated universal time), daylight saving on/off
Sunrise/sunset display
Sunrise, sunset time display
Sunrise time and sunset time for specific date
Stopwatch
1/10-second stopwatch
Measuring capacity: 999:59'59.9''
Measuring modes: Elapsed time, split time, 1st-2nd place times
Timer
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)
Alarm/hourly time signal
5 daily alarms (with 1 snooze alarm)
Hourly time signal
Light
LED backlight (Super Illuminator)
Full auto LED light, selectable illumination duration (1.5 seconds or 3 seconds), afterglow
Light color
LED:White
Calendar
Full auto-calendar (to year 2099)
Mute feature
Button operation tone on/off
Energy saving feature
Power Saving (display goes blank to save power when the watch is left in the dark)
Battery display/alert
Battery level indicator
Run time
Approx. battery operating time:
7 months on rechargeable battery (operation period with normal use without exposure to light after charge)
27 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)
Accuracy
Accuracy: ±15 seconds per month
Other features
12/24-hour format
Regular timekeeping:
Hour, minute, second, pm, month, date, day
Duplex LC display