Quick answer: the Casio F-B100W is a slim digital watch with Bluetooth smartphone linking and a built-in step tracker. Start by checking which full reference is available for your delivery address, then verify the seller, warranty, returns policy, and final landed cost before you buy.
The official Casio Japan page for the F-B100W-1AJF confirms a 2026 model with Bluetooth time adjustment, step counting, and everyday water resistance. Retail availability, colour suffixes, warranty coverage, and final price vary by market, so use this guide to compare the right listing rather than relying on a thumbnail or a shortened product title.
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Check live F-B100W listings by exact model
Start with the exact 1A, 1B, or 3A reference you want. Compare the complete model code, seller rating, delivery date, return policy, and final checkout price—not just the headline price.
Compare current F-B100W 1A / 1B / 3A listings on Amazon →
F-B100W-1A, 1B and 3A: choose by the full reference
Casio’s F-B100W series page lists F-B100W-1A, F-B100W-1B, and F-B100W-3A. Use the full suffix to distinguish the exact listing you are considering. Do not assume a suffix changes the watch module or Bluetooth functions without confirming the official product page and the seller’s complete description.
| Listing reference | What to verify before buying | Best next step |
|---|---|---|
| F-B100W-1A | Full reference, listed colour details, seller, and delivery estimate | Open the listing and match the complete code |
| F-B100W-1B | Complete product title, returns policy, and warranty information | Compare seller terms before ordering |
| F-B100W-3A | Official model code in the description, not only a shortened title | Confirm the exact configuration with the seller listing |
Confirmed Casio F-B100W specifications
Casio Japan lists the following details for the F-B100W-1AJF. They are a reliable reference for the Japan model; check the product page for your own delivery market before ordering.
| Item | Official Japan reference |
|---|---|
| Release and list price | August 2026; ¥8,800 including tax in Japan |
| Case size and weight | 41.9 × 38.1 × 8.8 mm; 26 g |
| Materials | Resin case; bio-based resin band |
| Water resistance | Everyday water resistance |
| Bluetooth | Smartphone link for automatic time adjustment and watch settings |
| Activity functions | Step tracker, 1/100-second stopwatch with 200 lap memories, timer, five alarms, and LED backlight |
Source: Casio Japan F-B100W-1AJF product page. Casio also describes CASIO WATCHES app functions such as time adjustment, settings, world time, life-log data, Time & Place, and phone finder. App features and availability should be confirmed for the exact market where you will use the watch.
Who the F-B100W is for — and who should choose another watch
Choose the F-B100W if you want a light, compact digital Casio with Bluetooth-connected convenience and everyday step tracking. It is a sensible fit for walking, commuting, and casual exercise when you prefer a smaller watch over a large smartwatch.
Choose another watch if you need medical-grade activity measurement, confirmed cross-border warranty coverage, or a rugged shock-resistant case for demanding outdoor use. For a larger, more rugged option, compare Best G-SHOCK Watches for Beginners.
Before checkout: 4-point buying checklist
- Match the full reference: do not buy based only on “B100W” in a search result.
- Confirm delivery: check whether the retailer delivers to your country and whether import charges may apply.
- Check seller protection: review seller rating, returns policy, and warranty terms.
- Compare the final price: include shipping and taxes, not only the product price.
Compare current F-B100W 1A / 1B / 3A listings on Amazon →
Need more technical detail?
For the model-number context and a separate specifications overview, read our Casio F-B100W Bluetooth specs guide. If you are comparing more widely available connected Casio options, see our best Casio Bluetooth step tracker watches guide.
F-B100W buying FAQ
How do I make sure I am buying the right F-B100W variant?
Compare the full model reference in the product title and description, then check the listed colour, seller, warranty, and returns policy. Product thumbnails and shortened titles are not enough on their own.
Can I buy the F-B100W internationally?
It depends on the individual seller and destination. Check delivery availability, estimated arrival date, import charges, and return policy before placing an order. Do not treat the Japan list price as an international marketplace price.
Should I choose an F-B100W or a G-SHOCK?
Choose the F-B100W for a lighter, classic digital style with connected features. Choose a G-SHOCK if your priority is a larger, more rugged case.
Final recommendation
The F-B100W is most compelling if you want Casio’s classic digital-watch format with Bluetooth convenience and simple daily step tracking. Before checkout, match the exact suffix, confirm seller reliability and delivery-country compatibility, and re-check the listing details.
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