Casio to Release PRO TREK with Quad Sensor and Smartphone Link Functions

Useful Info Measured by Sensor and Stored on App to Support Outdoor Activities

July 31, 2019


Tokyo, July 31, 2019 — Casio Computer Co., Ltd., announced today the latest addition to the PRO TREK line of outdoor watches. The PRT-B50 and PRT-B50FE are the first PRO TREK models with quad sensor and Smartphone Link functions.

The new PRT-B50 and PRT-B50FE are the latest models in the evolution of the PRO TREK line, and they are packed with features that make them even easier to use for outdoor activities. The new watches are equipped with quad sensor — three sensors that detect compass bearing, barometric pressure/altitude, and temperature, plus an accelerometer for counting steps. They also come with Smartphone Link functions, linking to the PRO TREK Connected app on a smartphone using Bluetooth® to offer a host of functions that support outdoor activities. These include a location indicator that shows the direction and distance to a destination saved to the app, automatic time adjustment, tracking of calories burned, which is calculated based on step count and altitude data, and trekking logs.

For improved usability, the user can set the watch modes from the app, including turning modes on or off, and changing the sequence in which modes appear on the display. This allows the user to customize the watch display according to how the watch is used; just choose to display only frequently used functions, such as timers and alarms, or change the display sequence.

For optimum readability, the PRT-B50 and PRT-B50FE have a wide watch face that incorporates a large, rotating bezel and Arabic numeral indices. The new models have been designed for ease of use in a wide range of outdoor activities, with a urethane band that features a 3D texture throughout and a strap keeper that stays in place.

  • Special packaging and replaceable band only available with PRT-B50FE-3.
Special package
(Exclusive to PRT-B50FE-3)
Replaceable band
(Exclusive to PRT-B50FE-3)

Quad sensor

Compass bearing
Barometric pressure / Altitude
Accelerometer for counting steps

Main Smartphone Link functions of PRT-B50 and PRT-B50FE

Trekking log

The app automatically records altitude data from the watch and GPS data from the smartphone. The user can also manually acquire altitude data at any point and plot that point on the trek route.

Calories burned

Displays the calories burned as calculated based on step count and altitude data, saving it as an activity log.

Location indicator

The user can operate the watch buttons to save the current location in the app. In this mode, the compass bearing of the saved location point is indicated by the second hand of the watch and the distance is indicated on the LCD.

Customizable mode/display

Using the app, the user can turn the watch modes on or off and change the sequence in which the modes appear on the display. This allows the user to customize the display for the intended use, for instance showing only certain functions or changing the sequence to show frequently used functions first. The default content on the LCD can also be customized.

Automatic altitude adjustment (four times per day)

Altitude measurement values on the watch are automatically adjusted based on altitude data acquired from the smartphone GPS.

Automatic time adjustment (four times per day)

The watch connects to the app to automatically download global time updates such as time zone changes and daylight savings time (DST) data by country. The time rules are stored on the watch to automatically adjust the time based on the latest data.

World time mode

The user can set the world time for more than 300 cities simply by selecting a city from the world map or city list in the app.

Mobile phone finder

By operating the watch, the user can trigger an audible alert on the mobile phone even if it is set to silent mode. This helps in locating the phone.

PRO TREK Connected
Trekking Log
Trekking Log (detail)
Location Point
  • App screen may differ in official release.

PRT-B50 and PRT-B50FE Specifications

Low-temperature resistant (-10°C/14°F)
Water Resistance
100 meters
Digital Compass
Measures and displays direction as one of 16 points with the second hand; measuring range: 0° to 359°; 60 seconds continuous measurement; magnetic declination adjustment; auto level correction function; bearing memory; hand indication of north; bidirectional calibration and magnetic declination correction
Measuring range: 260 hPa to 1,100 hPa (7.65 inHg to 32.45 inHg); atmospheric pressure change indicator (±10 hPa); atmospheric pressure tendency graph; barometric pressure tendency information alarm (beep and arrow indicates significant changes in pressure)
Measuring range: -700 m to 10,000 m (-2,300 ft. to 32,800 ft.); measuring unit: 1 m (5 ft.); manual memory measurements (up to 14 records, each including altitude, date, time); auto log data (high/low altitudes, cumulative ascent and descent of particular treks); altitude change indicator (±100 m / ±1000 m); other: relative altitude readings (-3,000 m to 3,000 m); measurement interval setting (every 5 seconds / every 2 minutes)
Measuring range: -10°C to 60°C (14°F to 140°F); measuring unit: 0.1°C (0.2°F)
Step Counter
Step count display range: 0 to 999,999; power saving: sensor sleep mode after fixed period of non-activity
World Time
38 cities (38 time zones, auto summer time (DST) switching, DST on/off) and Coordinated Universal Time; home time/world time switching
1/100-second; 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 to 60 minutes (1-minute increments)
5 daily alarm, hourly time signal
Other Functions
Smartphone link function; sunrise, sunset time display; hand shift feature (manual or auto [during altitude, barometric pressure, and temperature measurement]); battery level indicator; power saving; full auto-calendar; 12/24-hour format; button operation tone on/off; auto double LED backlight with afterglow: 1.5/3.0 seconds
Battery Life
Approx. 2 years on CR2025
Size of Case
57.5 × 50.8 × 15.8 mm
Total Weight
Approx. 64 g
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