WSD-F21HR-RDBGB Smartwatch

WSD-F21HR-RDBGB Smartwatch


WSD-F21HR-RDBGB Smartwatch


At a glance

Be even more in tune with your body and surroundings with the PRO TREK F21, now kitted out with a heart rate monitor. Strap on your watch and have an optical sensor using LED light, detect your blood flow and reporting back to you your heart rate in both value and graphs. The measured heart rate information is expressed as one of five heart rate zones, allowing the user to see at a glance the elapsed time and heart rate information, helping you track your fitness progress for up to 20 hours during all your adrenaline filled adventures. This smart watch also contains many more features, such as full colour GPS navigation, altitude, temperature and pressure sensors and 50 meter water resistance. Additionally, new road and trail running apps have been added to present heart rate, pace and distance along your journey, helping you explore unfamiliar routes with ease. Set and track your fitness goals with the latest PRO TREK.



12/24 Hour Format

Times can be displayed in either a 12-Hour or 24 Hour Format.

Activity App

The Activity app is a CASIO Android Wear app. It measures the time you spend engaged in different activities.

(trekking, fishing, cycling, paddle and snow)

Adjustable Screen Brightness

5 levels


Altitude Measurement to 10,000m: A built-in pressure sensor measures barometric pressure, which is converted to relative altitude up to a maximum 10,000m.

Measuring range: -700 to 10,000m (-2,300 to 32,800ft)

Measuring unit: 1 metre (or 5ft)

Measurement accuracy: within +/-75m (+/-250ft)

Measurement interval: 1 second (shortest)

Altitude graph (past 24 hours)

Manual altitude correction (auto correction using location information thorough CASIO MOMENT SETTER+, Android only)

Auto Calendar

Allowances are made automatically for leap years and months of different lengths.

Automatic Time Adjustment

The watch will automatically synchronise it's time when connected to a compatible smartphone.

The time can also be adjusted manually.


A built-in pressure sensor measures barometric pressure, which is shown on the display.

Display range: 260 to 1,100 hPa (7.6 to 32.5 inHg)

Display unit: 1 hPa (0.1 inHg)

Measurement accuracy: within +/- 3 hPa (+/- 0.1 inHg)

Measurement interval: 1 minute.

Battery Life

Normal use without GPS- more than 1 day.

Timekeeping mode only- more than 1 month.

With GPS at 1 second intervals- up to 9 hours (accuracy priority) up to 25 hours (battery priority)

With GPS at 6 minute intervals- up to 2 days with location tracking saving on.

All values stated are approximate.

magnetic charge terminal. About 2.5 hours for full charge.

Bluetooth® Connectivity

The watch can connect to compatible smartphones to offer a range of features

Bluetooth® v4.1

Low Energy Support

Built in GPS

(American GPS, Russian GLONASS, Japanese "MICHIBIKI" QZSS)

Steadily receives positioning data and displays your current position on a full colour map

Built in Sensors

Magnetic (direction), Pressure (atmospheric/ altitude), Accelerometer and Gyrometer

Digital Compass

A built-in direction sensor detects magnetic north displaying both this and your current direction on the watch face.

Measuring Range: 0 - 359 degrees

Measuring Unit: 1 degree

Hand indication of North.

Magnetic declination calibration

Gradient calibration

Bearing memory.


(H x W x D)

Approximately 61.7 x 57.7 x 16.8mm

Dual Layer Display

1.32 inch Colour TFT LCD (320 x 300 pixels) + Monochrome LCD

Fishing Timer

Indicates the suitability of a specifice date/ time for fishing.

Heart Rate Monitor

Automatic display of heart rate data on display.

five heart rate zones.

Display of heart rate and zone, and heart rate graph.

Location Memory App

Map screen, route screen, selectable map skin, map downloading (offline maps), voice memo, landmark, revisit marks, history screen.


(water resistant)

Moment Setter App

You can use the CASIO MOMENT SETTER+ app to perform watch functions from your smartphone.

Climbing, trekking, fishing, cycling, paddle and snow notifications)

My Graph Feature

My Graph shows a graphic representation of your activities on the current day. It shows the type of activity you performed and when you performed it.

Daily activity pattern: Stopped, walking, running, vehicle, calories burned, steps, altitude (highest achieved that day) and workout time.

OS: Android Wear 2.0

To use this unit, a smartphone equipped with the following is required. Supported features may vary by platform and country. Android ™: Android ™ 4.4 or higher (excluding Go edition) iOS: iOS 10 or

Sunrise/Sunset Display

Sunrise and sunset times + direction are displayed.

Based on current location, direction accuracy depends on compass.

Tide Graph

Tidal movements are displayed for your chosen location.

Tool App

Compass, Altimeter, Barometer, Sunrise/ Sunset, Tide Graph, Fishing Time and My Graph

Watch Faces

3 favorites, more can be added.

Water Resistant

50 Metre / 5 Bar

5 Bar Water Resistant means that the watch is also suitable for swimming but NOT snorkelling

World Time

Displays the current time in major cities and specific areas around the world.

Related Links

Support Information