Casio Pro Trek PRJB-001 Lineup Bluetooth® Tough Solar Bio-Based Watch PRJB001-5D PRJ-B001-5D PRJ-B001-5

A down-to-earth, user-friendly timepiece in earthy hues from the PRO TREK line of authentic outdoor gear for nature lovers.

The band, bezel, case, buttons, and case back — each made with resin in a different outdoorsy color — come together in a unified design that moves seamlessly with you from outdoor adventures to everyday settings.

Like its base model, the PRJ-B001, this easy stylish timepiece is equipped with superior functionality, too, with Tough Solar charging and Bluetooth® to pair with a smartphone. Press a button on the watch to record date, time, and position on a map within the dedicated smartphone app, for a useful way to log your journeys. Find new ways to appreciate the outdoors by reminiscing about breathtaking scenic spots and taking note of places to revisit.

Bio-based resin for key resin components in the case, band, and more is not only expected to help reduce environmental impact, but makes for a lighter watch, as well. 

Lightweight, compact, stylish, and practical — this timepiece is all about the great outdoors.

Case / bezel material: Resin / Bio-based resin
Bio-based resin band
Neobrite
Mineral Glass
100-meter water resistance
Low temperature resistant (-10℃)
Tough Solar (Solar powered)
Double LED light
LED light for the face (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
LED backlight for the digital display (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
LED:White
Mobile link (Wireless linking using Bluetooth®)
Time adjustment
Bluetooth: Connects to a smartphone and automatically adjusts the time
World time
38 time zones (38 cities + coordinated universal time), city code display, city name display, daylight saving on/off, auto summer time (DST) switching, Home city/World time city swapping
1/100-second stopwatch
Measuring capacity: 00'00''00~59'59''99 (for the first 60 minutes)
1:00'00~23:59'59 (after 60 minutes)
Measuring unit: 1/100 second (for the first 60 minutes)
1 second (after 60 minutes)
Measuring modes: Elapsed time, lap/split time
Countdown timer
Measuring unit: 1 second
Countdown range: 60 minutes
Countdown start time setting range: 1 second to 60 minutes (1-second increments and 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 (Hands move out of the way to provide an unobstructed view of digital display contents.)
Day display (days of the week selectable in six languages)
Regular timekeeping: 
Analog: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (battery level, mode)
Digital: Hour, minute, second, pm, month, date, day
Accuracy: ±15 seconds per month (with no mobile link function)
Approx. battery operating time:
7 months on rechargeable battery (operation period with normal use without exposure to light after charge)
18 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)
Size of case : 50.3 × 46 × 13.6 mm
Total weight : 44 g