The PRJ-B001/PRJ-B001B is the lightest model* among PRO TREK, and is perfect for those who enjoy long trails and ultralight hikes.
This model is the first to feature a Rotary Guard bezel
By rotating the bezel, you can switch between two styles.
The stylish square design makes it easy to use every day, and the buttons are hidden to prevent accidental operation while walking or when using the device around town.
On the other hand, when you are doing activities or other situations where you need to use many functions, you can rotate the bezel 45 degrees to reveal the buttons, changing the shape to make it easier to operate.
The PRJ-B001 uses a soft urethane band that reduces stress even when used for long periods of time.
In addition, the PRJ-B001B features a new style of bungee cord band inspired by outdoor gear.
The combination of cross bands and bungee cords improves ventilation and the fit to the arm.
Simply hook the loop-type elastic cord onto the hook and you can easily wear it over your clothing or on bare skin.
The color scheme is available in charcoal gray, off-white, and dusty blue variations that blend in with nature.
The fluorescent colors of the hour markers and bezel add color to your outdoor fashion.
The main resin parts, such as the case and band, are made from environmentally friendly biomass plastic.
In addition, it is equipped with Tough Solar and Bluetooth®, and can be connected to a smartphone.
By operating the buttons on the watch, the current time and location can be recorded on a map in the dedicated app, and can be managed as an activity log.
This makes it the lightest model available, allowing you to look back on memories of scenic spots and keep a record of places you want to revisit, expanding the ways you can enjoy the outdoors.
*As of April 2024. Tough Solar (solar charging system)
- 10 ATM water resistance - Mobile Link function (function linkage via Bluetooth® communication with compatible mobile phones)
- Needle retraction function (When the needle overlaps with the LCD display and is difficult to see, the needle can be temporarily retracted from above the LCD display)
World time: 38 cities (38 time zones, daylight saving time automatic setting function) + UTC (Coordinated Universal Time), Home city swap function Stopwatch (1/100 seconds (less than 1 hour) / 1 second (more than 1 hour), 24 hour counter, lap / split)
- Timer (set unit: 1 second, maximum set: 60 minutes, measured in 1 second units)
・ 5 time alarms
・ Time signal
・ Battery indicator display
・ Power saving function (display turns off after a certain period of time in a dark place to save power)
・Fully automatic calendar ・12/24 hour display switching ・Low temperature resistance (-10℃)
- Operation sound ON/OFF switching function - Day of the week display (6 languages: English, Spanish, French, German, Italian, Russian)
Double LED light: LED light for dial (with Super Illuminator, afterglow function, afterglow time switching (1.5 seconds/3 seconds)), LED backlight for LCD (with Super Illuminator, afterglow function, afterglow time switching (1.5 seconds/3 seconds))
・ Operating time from full charge without solar power generation When using functions: Approximately 7 months When in power saving mode: Approximately 18 months * When not linked to a smartphone, it operates with normal quartz accuracy (average monthly difference of ±15 seconds)



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Casio  Clock  Silver  ソーラー腕時計  CASIO PRO TREK Hiker Line Bluetooth Equipped Tough Solar Biomass Plastic Bungee Cord Band PRJ-B001B-2JF Men's Dusty