New Casio F-B100W watches with Bluetooth step-tracking revealed ahead of August launch

Casio's rumored digital watch upgrade, the F-B100W, has just resurfaced, but this time through a retailer listing that fills in most of the details earlier leaks could only estimate.

Casioblog first reported on the watch weeks ago. We got hints of Asian trademark filings for a model called the F-B100W-1A. The source tied it to Casio's recently released ABL-100 series, which gets smart features and a vintage metal design. The F-100, which was first sold in 1978, was Casio's first watch with a full plastic case and was one of the templates for the iconic F-91W (curr. $22 on Amazon).

The new listing confirms the "B" does mean Bluetooth, syncing to a companion app that is dubbed "Mobile Link," though that may be a translation error. The watch automatically counts steps via a motion sensor, tracks progress toward a daily goal set between 1,000 and 50,000 steps, and can sync activity data to the app as a running log. The listing also says the strap uses bio-based resin.

The case measures 41.9 x 38.1 x 8.8 mm and weighs 26 grams, which is close to Casioblog's earlier estimate, and runs on a CR2016 coin cell rated for about two years, rather than the Tough Solar charging found on pricier G-Shock models. Other functions include a 1/100-second stopwatch with 200-record memory, a countdown timer, five daily alarms, dual time, hourly chime, and a fully automatic calendar through 2099.

The listing shows three colorways: black-on-black (F-B100W-1B), a black case with blue accents (F-B100W-1A), and a green resin version (F-B100W-3A). Pricing isn't listed, and Casio still hasn't officially confirmed the watch, though the retailer's packaging again points to an August availability window, just like the freshly spotted Edifice and Pro Trek models.