Introducing the all-black model with yellow accents from the PRO TREK Hiker Line's lightest model
* , the PRJ-B001, featuring a nighttime design for enhanced safety.

Of particular note is the dot-shaped reflector used on the bungee cord.

Increases safety during nighttime activities and travel, ensuring visibility in the dark.
It also helps prevent you from leaving things behind when outdoors.

The innovative 2-way design features a unique rotary guard bezel, allowing you to choose between two styles depending on your needs.

The square style is suitable for everyday use and the buttons are hidden to prevent accidental operation.

When you're active, simply rotate the bezel 45 degrees to reveal the buttons for improved operability.

Superior comfort and environmental friendliness.
The bungee cord band, inspired by outdoor gear, is combined with the cross band to improve breathability and fit to the arm.

The loop-type elastic cord and hook make it easy to wear on bare skin or through clothing.

The case and other major parts are made from environmentally friendly biomass plastic.

Equipped with Tough Solar, it provides reliable power supply even during long periods of outdoor activity, and charges with minimal light, so you don't have to worry about running out of battery even during long trekking trips.

Bluetooth? connectivity allows you to record your current location and time on a map in the dedicated app by simply operating the watch buttons.

You can record scenic spots and places you want to revisit in your activity log, enriching your outdoor experience.

It combines lightness and functionality that is ideal for long trails and ultralight hikes, and will safely support your outdoor life as a reliable partner day and night.
* As of August 2025.Tough Solar (solar charging system).
? 10 ATM water resistance ?Mobile link function (function linkage via Bluetooth? communication with compatible mobile phones).
- Hand retraction function (When the hands overlap the LCD display and are difficult to see, you can temporarily retract the hands from above the LCD display).
World time: 38 cities (38 time zones, daylight saving time automatic setting) + UTC (Coordinated Universal Time),.
Home city swap function Stopwatch (1/100 second (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 increments).
5 time alarms, Hourly time signal, Battery indicator, Power saving function (display turns off after a certain period of time in the dark to save power).
- Fully automatic calendar - 12/24 hour display switching - Low temperature resistant (-10?C).
- Operation sound ON/OFF switching function - Day of the week display (switchable between 6 languages: English, Spanish, French, German, Italian, and Russian).
Double LED light: LED light for the dial (Super Illuminator, afterglow function, selectable afterglow time (1.5 seconds/3 seconds)),.
LED backlight for the LCD (Super Illuminator, afterglow function, selectable afterglow time (1.5 seconds/3 seconds)).
Operating time from full charge without solar power generation: Approximately 7 months When using functions: Approximately 18 months When in power saving mode:
* When not linked to a smartphone, the watch operates with normal quartz accuracy (average monthly deviation of ?15 seconds).

Model Number: PRJ-B001B-1JF

Tags:

Casio  PROTREK  Bluetooth  Black  Silver  MensWatch  ToughSolar  EcoFriendly  JapanModel  PRJB001B1JF  HikerLine