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a transparent illustration of a compass behind a black digital PRG-340 with orange highlights above a green marshy estuary with river


Black PRG-340 Digital watch with compass and orange highlights

Bio-mass plastics used for most parts: A digital model with a duplex LCD

We’ve added a duplex LCD to our digital model with direct function buttons for one-push measurements. The rotating bezel, case, case back, and urethane band are made with plant-derived, renewable biomass plastics. Introducing this PRO TREK and celebrating its trailblazing progress in every direction: easy to use, easy to read, easy on the environment.

Separated bezel and face layers of PRG-340 on a black background


Digital compass now even more
readable with the duplex LCD

The dual-layer LCD allows compass graphics to be shown on the top layer, while the bottom layer offers a large display of the time and various measurements. We’ve also made the LCD slimmer to minimize bulk, even with the dual-layer construction.

Black and white biomass pellet material next to PRG-340 watch on black background


Earth-friendly craftsmanship with
Bio-mass plastics

The case, case back, and soft urethane band are all made with the Earth-friendly green material known as bio-mass plastics. Using renewable organic resources such as castor oil plants and corn helps reduce the ecological footprint. Eco-consciousness rendered in physical form, a fitting material for a real outdoor tool.
*Bio-mass plastics are not used in the metal band of the PRG340T.

Three quarter view of PRG-340 partially in shadow


Direct function buttons for increased

Measure direction, air pressure and temperature, and altitude, each one available directly from a single button. The oversized buttons feature a nonslip finish for effortless use even when wearing gloves. In addition, improved sensor placement makes the side of the case even slimmer. The buttons are easier to press now, too.


Black PRG-340 watch with orange accents on topographic map

Rotating bezel and movable lug construction

The bezel incorporates a rotating mechanism, allowing it to be used for simple orientation memory. The movable lug structure enables the watch case and band to be laid flat — handy when working with paper maps, checking where you are and where you’re going.

Transparent Watch in front of a picturesque mountain scene with hiker

Triple Sensor (digital compass, barometer/altimeter, and thermometer) senses natural changes

Illustrative artwork depicting light passing through the face and bezel of a watch

Tough Solar powered for converting light to energy

Face of digital watch display in the dark illuminated by watch light

Super Illuminator (high-brightness full-auto LED backlight) for main-taining watch readability in the dark
*Image shows the PRG340-1.


  • 10-bar water resistance
  • Low-temperature resistance (-10℃)
  • Tough Solar (solar powered)
  • World time (48 cities)
  • Digital compass
  • Barometer
  • Altimeter
  • Thermometer
  • Sunrise, sunset time display
  • 1/10-second stopwatch (measuring capacity: 1,000 hours)
  • Countdown timer
  • 5 daily alarms
  • Full-auto LED backlight (Super Illuminator)

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