Go bold and bright. Get out and explore the great outdoors! 

In a first ever for a Casio timepiece, Neo-Brite phosphorescence is integrated into the solar dial design of the PRO TREK PRW-61LD to create a display that glows a soft green in the dark. Combined with blue luminescence on the index marks and hour, minute, and seconds hands, this PRO TREK delivers even greater visibility for the enhanced readability that your nighttime adventures require.

The case, band, and case back are made with bio-based resin, in keeping with the PRO TREK commitment to reducing environmental impact by using sustainable materials.

Delivering on outdoor utility, the model is equipped with Triple Sensor (digital compass, barometer/altimeter, and thermometer), as well as Multi-Band 6 radio wave reception from 6 transmission stations around the world, and Tough Solar to provide stable power for these functions and more. For optimum readability, the design features thick bar indexes to check time, direction, and other indicators at a glance, as well as slits on the band above and below the dial that serve as guides to quickly read the compass direction indicated by the second hand.

• Case / bezel material: Bio-based Resin / Stainless steel 
  
• Soft urethane band (Bio-based resin)
  
• Neobrite
  
• Mineral Glass
  
• Black ion plated bezel
  
• 100-meter water resistance
  
• Low-temperature resistant (-10℃/14℉)
  
• Tough Solar (Solar powered)
  
• Double LED light
  
• LED light for the face (Full auto LED light, Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
  
• LED backlight for the digital display (Full auto LED light, Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
  
• LED:White
  
• Time adjustment
  
• Radio-controlled Watch; Multi band 6
  
• 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
  
• Time calibration signal reception
  
• Auto receive up to six* times a day (remaining auto receives canceled as soon as one is successful)
  *5 times a day for the Chinese calibration signal
  
• Manual receive
  
• The latest signal reception results
  
• Digital compass
  
• Measures and displays direction as one of 16 points
  
• Measuring range: 0 to 359°
  
• Measuring unit: 1°
  
• 60 seconds continuous measurement
  
• Hand indication of north
  
• Bidirectional calibration
  
• Magnetic declination correction
  
• Altimeter
  
• Measuring range: -700 to 10,000 m ( -2,300 to 32,800 ft.)
  
• Measuring unit: 1 m (5 ft.)
  
• Hand indication of altitude differential
  
• Manual memory measurements (up to 30 records, each including altitude, date, time)
  
• Auto log data (High/low altitudes, cumulative ascent and descent)
  
• Others: Relative altitude readings (±100m /±1000m),
  
• 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)
  
• Hand indication of pressure differential
  
• Atmospheric pressure tendency graph
  
• Barometric pressure tendency information alarm (beep and arrow indicates significant changes in pressure)
  
• *Changeover between hPa and inHg
  
• Thermometer
  
• Display range: -10 to 60℃ (14 to 140℉)
  
• Display unit: 0.1℃ (0.2℉)
  *Changeover between Celsius (℃) and Fahrenheit (℉)
  
• World time
  
• 29 time zones (29 cities + coordinated universal time), One-touch UTC Time Zone Access, daylight saving on/off, Home city/World time city swapping
  1/100-second stopwatch
  
• Measuring capacity: 23:59'59.99''
  
• Measuring modes: Elapsed time, split time, 1st-2nd place times
  
• Countdown timer
  
• Measuring unit: 1 second
  
• Countdown range: 60 minutes
  
• Countdown start time setting range: 1 minute to 60 minutes (1-minute increments)
  
• 5 daily alarms
  
• Hourly time signal
  
• Battery level indicator
  
• Power Saving (display goes blank to save power when the watch is left in the dark)
  
• Full auto-calendar (to year 2099)
  
• 12/24-hour format
  
• Button operation tone on/off
  
• Hand shift feature (manual or auto (during altitude, barometric pressure, and temperature measurement))
  
• Regular timekeeping:
  
• Analog: 3 hands (hour, minute (hand moves every 10 seconds), second)
  
• Digital: Hour, minute, second, am/pm, 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)
  
• 25 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)
  
• Size of case : 51 × 47.4 × 14.7 mm
  
• Total weight : 53 g