Casio ProTrek PRW-35 — Small, Lightweight and Eco-Friendly

*PRW-35-1A – Updated June 2023 color!
Battery Years★★★★★
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PRW-35 Model Range *may be updated

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Quick Content Guide

About PRW-35 in Short.

Compact, lightweight digital watches made with bio-based resins Featuring a digital display that’s easy to read and use, even on a more compactly sized watch. Key resin components are made with eco-friendly bio-based resins. The lighter weight of these watches also supports your active and eco-conscious outdoor life. Ideal for camping, mountain-climbing, and everything in between.

General Information

Price$270 *average Amazon Price, we may earn commission from purchases
Year of First Release2023
Battery Type Solar (ProTrek Batteries)
Manual3490 (official)

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ProTrek PRW-35 on the wrist!

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The most distinctive specs of PRW-35 *Editorial
Biomass plastics in the case, band, and case back (the environmentally friendly biomass plastics are produced using materials derived from castor seeds and corn, as well as other raw materials)
— 100-meter water resistance (good for swimming but not for deep diving)
— Low temperature resistant (stable operation of the watch is guaranteed even at a temperature of -20°C)
— Radio-controlled Watch; Multi band 6 (additional way for time sync. This watch receives time calibration radio signals that keep the displayed time accurate)
— Tough Solar (CASIO’s original solar-charging system converts not only sunlight but also light from fluorescent lamps and other sources into power)
— Digital compass (measures and displays direction as one of 16 points)
Thermometer (can measure and display the outside temperature in a range from -10 C to 60 C)
Barometer (measures the air pressures and displays tendencies in the weather)
Altimeter (The electronic mechanism “estimates” the altitude based on the air pressure)
— Sunrise/sunset display (After entering the geographical location, sunrise and sunset times can be displayed for any given date)

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Other ProTrek PRW Watches *similar by price and functions but different by cases

These are not all ProTrek PRW Series. Here is a list of All ProTrek PRW Watches →

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Official PRW-35 Specs / Features *for base version PRW-35-1A

  • Case / bezel material: Bio-based resin / Stainless steel
  • Bio-based resin band
  • Mineral Glass
  • 100-meter water resistance
  • LED backlight (Super Illuminator)
    Full auto LED light, selectable illumination duration (1.5 seconds or 3 seconds), afterglow
  • Tough Solar (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)
    Manual receive
    The latest signal reception results
    *5 times a day for the Chinese calibration signal
  • 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 indicate 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, Home city/World time city swapping
  • 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 he 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:
    6 months on rechargeable battery (operation period with normal use without exposure to light after charge)
    22 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)
  • Size of case : 51.2 × 44.6 × 13 mm
  • Total weight : 45g

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Enjoy Japanese approaches to Travel and Functional ProTrek Watches!

Lightweight and compact. The smaller case does not impede wrist movement and won’t get caught on your shirt cuff. The compact size also sits comfortably on slimmer wrists, too. The use of bio-based resins for the case-back also keeps the weight down, so you can wear this watch in comfort during long days spent enjoying the great outdoors.

Expected to reduce environmental impact bio-based resins. The resin components of the case, case back, and band are made with bio-based resins produced using renewable organic resources such as castor oil plants and corn, helping to reduce the ecological footprint of these watches. Eco-consciousness rendered in physical form, a fitting material for a real outdoor tool.

Large dedicated function buttons for one-push measurements. Get measurements of compass bearing, barometric pressure/temperature, and altitude with a single push of one of the three large dedicated function buttons. The non-slip knurled finish makes for more intuitive and accurate button operation, even when wearing gloves.

Soft urethane band for a comfortable fit. The band is made with soft urethane for both strength and flexibility. Slits help shed perspiration for more comfortable wear, and a simple lever makes it easy to attach and remove — handy for cleaning and other maintenance. The PRW-35Y-3 features a rich blue-green band that recalls the forest.

STN LCD for excellent readability. The display is a highly readable super-twisted nematic (STN) LCD, boasting a large, bold digital readout that makes checking the time and other measurements intuitive.

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

Multiband 6 radio-controlled solar watch for accurate timekeeping

Super Illuminator (high-brightness full-auto LED backlight) for maintaining watch readability in the dark

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PRW-30 Comparison Table with similar PROTREK Watches

Will be soon…

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Recent News about PRW-35 

All Casio PRW-35 News →

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You ask, we answer…

What does Tough Solar in PRW-35 mean?

CASIO’s original solar-charging system converts not only sunlight but also light from fluorescent lamps and other sources into power.

What is Altimeter in PRW-35?

It’s the electronic mechanism that “estimates” the altitude based on the air pressure.

How does Digital compass in PRW-35 work?

It measures and displays direction as one of 16 points.

What does Barometer in PRW-35 do?

It measures the air pressures and displays tendencies in the weather.

Can’t find a ProTrek of your dream? There are more watches!

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