Casio Collection Watch F-B100W-1AEF

Presenting the Casio F-B100W-1AEF, the evolution of the best-selling digital watch in history. The square silhouette iconic to the F-91W returns here with a matte black resin case, impressed markings along the bezel sides and a segmented resin strap with a smooth texture. The light grey dial houses a dual stacked LCD layout: the upper, narrower display shows day of the week, date, Bluetooth battery indicator and the Step Tracker progress bar. The central main display shows the time in large, highly legible digits with seconds in the lower right corner. Along the bottom edge of the crystal sit the Bluetooth logo and WATER RESIST legend, while the case sides feature four pushers for ADJUST, MODE, LIGHT and SEARCH, following the classic layout of the F-series family.

Inside runs a Casio digital module with Bluetooth Low Energy connectivity, allowing synchronisation with the official Casio Watches smartphone app. This connection automates time setting, alarm management and step history review. The Step Tracker logs daily activity with a progress bar visible directly on the display. Functions include: automatic time and calendar via Bluetooth, up to five programmable alarms, stopwatch, countdown timer, world time, battery indicator, MUTE function to silence alarms and power saving mode. A front-facing LED light illuminates the dial in low-light conditions.

The F-B100W belongs to the Casio Standard collection, the line that since the 1970s has brought Japanese precision to a global audience. The DNA of the F-91W, launched in 1991 and widely regarded as the best-selling watch of all time, runs through every edge of this model. Casio updates it without betraying its essence: same square case, same minimal weight, same instant legibility, but with the technology layer today's user demands. A piece that is simultaneously a cult object and a daily tool.

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Technical Specifications

Reference: F-B100W-1AEF
Module/Caliber: Digital with Bluetooth Low Energy
Type: Digital
Movement: Digital quartz
Connectivity: Bluetooth Low Energy (BLE)
Water Resistance: WR (Water Resistant)
Case Material: Resin
Case Color: Matte black
Case Shape: Square
Diameter: 43.0 mm
Strap Material: Resin
Strap Color: Black
Dial Color: Light grey
Display: Dual LCD (upper and lower screens)
Crystal: Resin glass
Light: Front LED
Functions: Automatic time and calendar via Bluetooth, Step Tracker with progress bar, 5 alarms, stopwatch, countdown timer, world time, battery indicator, MUTE mode, power saving
Compatible App: Casio Watches (iOS and Android)
Weight: Ultra-light (resin)
Collection: Standard Digital
Made for: Unisex daily use