Pro Trek Bio Mass Tough Solar Watch

SKU: PRG340-3

Rated 5.0 out of 5
Based on 2 reviews
$599.00 AUD $349.00 AUD

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Designed for nature enthusiasts, the Casio Pro Trek Bio Mass Tough Solar Watch PRG340-3 combines advanced functionality and sustainable materials for a remarkable outdoor gear. This innovative timepiece is an embodiment of Casio's commitment to caring for the environment.

Eco-Friendly Materials

This watch features environmentally friendly biomass plastics, a breakthrough in sustainable polymers production. The watch case and band are expertly crafted from biomass plastics derived from castor oil and corn. This not only reflects our dedication to reducing environmental impact, but also propels the shift towards a circular economy.

Advanced Functionality

Beyond its sustainable design, this watch comes loaded with practical features. It uses a duplex LCD that separates the compass graphics and clock functions for easy legibility and navigation. Its rotating bezel simplifies recording compass readings, perfect for explorers and adventurers.

Tough Solar Charging System

Never worry about running out of power in the middle of an adventure. The Pro Trek PRG340-3 is equipped with a Tough Solar charging system that ensures its advanced functionality is always ready to work for you. Even in the great outdoors, your timepiece remains fully functional.

Make a statement with a timepiece that doesn't just tell time, but also tells a story of sustainability and innovation. Choose the Casio Pro Trek Bio Mass Tough Solar Watch PRG340-3 and leave a gentler footprint on your outdoor explorations.

Feature Overview


2 Years


Casio Box

Case Size




Glass Material

Mineral Crystal



Water Resistance

100 Meters

Band Type

Green Biomass Plastic


Case size (L× W× H): 54.7 × 51.7 × 15.1 mm
Weight; 54 g
Case and bezel material: Case / bezel material: Biomass plastics
Band: Soft urethane band (biomass plastics)
Water resistance: 100-meter water resistance
Environmental resistance: Low-temperature resistant (-10℃/14℉)
Power supply and battery life: Solar powered
Sensor feature:
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)
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
Display range: -10 to 60℃ (14 to 140℉)
Display unit: 0.1℃ (0.2℉)
*Changeover between Celsius (℃) and Fahrenheit (℉)

Glass: Mineral Glass
Bezel features: Direction Bezel
Compatible band size; 145 to 215 mm
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, 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)
Alarm/hourly time signal:
5 daily alarms (with 1 snooze alarm)
Hourly time signal
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


average rating 5.0 out of 5
Based on 2 reviews
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100% of reviewers would recommend this product to a friend
Review posted
Reviewed by Colin P.
Verified Buyer
Rated 5 out of 5

Good value

For the “Special Price” paid the watch represents good value. A little disappointed at the size, it’s supposed to be 50mm + but looks tiny compared to other watches that I own. Currently trying to buy a new bracelet, however a genuine Casio bracelet is in the $70 plus range, which is crazy for a rubber strap that probably cost no more than $5.00 to make!

Otherwise the watch is a tough knock-about watch that you can wear literally anywhere without a scratch.

I recommend this product
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Review posted
Reviewed by David L.
Verified Buyer
Rated 5 out of 5

A timely purchase

A very stylish watch for everyday use

I recommend this product
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