• CASIO F-B100W-3AJF
  • CASIO F-B100W series
  • CASIO F-B100W iconic digital design
  • CASIO F-B100W comfort and ease of use
  • CASIO F-B100W slim, lightweight design: 8.8 mm thick and 26 g
  • CASIO F-B100W step tracking for walking and jogging
  • CASIO F-B100W smartphone connectivity
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CASIO · JAPANESE-MARKET REFERENCE

F-B100W-3AJF

F-B100W-3AJF

¥9,652 JPY
¥9,652 JPY
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Taxes included. Shipping calculated at checkout.

This CASIO digital watch combines classic styling with smartphone connectivity. A slim resin case and slotted resin band provide a light, comfortable fit. An integrated sensor automatically counts steps, which can be checked on the LCD. Bluetooth connection enables automatic time adjustment and settings through the dedicated app. Step data can also be transferred to the app for daily activity records. Major resin components in the band use bio-based resin.

Reference
F-B100W-3AJF
Case (H × W × D)
41.9 × 38.1 × 8.8 mm
Weight
26 g
Listed water resistance
Water resistant for daily use

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Spend ¥35,000 (Approximately $225 USD | €198 EUR) or more after product discounts and receive an additional ¥3,000 (Approximately $20 USD | €18 EUR) off your order subtotal.

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The qualifying subtotal excludes shipping and taxes. The qualifying amount and discount are based on Japanese yen. Amounts shown in your selected currency may vary with exchange rates.

Before & after your purchase

Read our shipping and return information before ordering. Model-specific warranty and repair guidance is available below.

Buying from JapanSize & function guide
Setup & support

Model reference: F-B100W-3AJF

Search the official manual using this model or the module number on your watch.

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Warranty & service

Local warranty service outside Japan is not guaranteed. Read our return and repair policy and ask about your exact reference before ordering.

Bracelet fit & adjustments

Check the case dimensions and band details in the specifications. Ask us about fit, included links and adjustment options before placing an order.

Packaging & included items

Included items can vary by reference. Contact us with the model number to confirm the box, documents and accessories.

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Product details
Model
F-B100W-3AJF
JAN / EAN
4549526428760
Band material
Resin band
Crystal material
Resin glass
Weight
26 g
Case size (L × W × H)
41.9 × 38.1 × 8.8 mm
Price
¥9,652 JPY
Country of origin
JP

Specifications

Release date August 2026
Case size (H × W × D) 41.9 × 38.1 × 8.8 mm
Weight 26 g
Case and bezel material Resin
Band Bio-based resin band
Water resistance Water resistant for daily use
Time adjustment Bluetooth: connects to a smartphone for automatic time adjustment
Power supply and battery life Approx. battery life: 2 years
Sensors Step counting: 0–999,999 steps; Goal achievement display, with targets from 1,000 to 50,000 steps in 1,000-step increments; Optional visual and audible reminder after periods of low activity; Seven-hour step graph with hourly activity shown in six levels

Exterior details

Glass Resin glass
Compatible wrist size 145–215mm

Watch functions

World time Dual time with home time swapping
Stopwatch Stopwatch: 1/100 second for the first hour, 1 second thereafter; 24-hour capacity; lap / split time; up to 200 records (year, month, day, hour, minute, lap / split time)
Timer Countdown timer: 1-second setting increments, maximum 60 minutes, 1-second measurement
Alarm 5 daily alarms and hourly time signal
Light LED backlight: afterglow, selectable illumination duration (1.5 seconds / 3 seconds)
Light color LED: amber
Calendar Full auto-calendar
Button operation tone Button operation tone on/off
Power saving Power saving on/off
Battery indicator and alerts Low battery alert
Accuracy Without smartphone connection, the watch operates at normal quartz accuracy (±15 seconds per month).
Other features 12/24-hour format
Mobile Link Bluetooth connectivity with a compatible smartphone
Compatible app CASIO WATCHES
App functions Automatic time adjustment; Easy watch settings; World time: approximately 300 cities; Life-log data; Time & Place; Phone finder
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