Casio Timeless 38mm Digital Resin Quartz Watch F-B100W-3AEF

The Casio Timeless F-B100W-3AEF combines a classic angular digital watch design with a slim 41.9 × 38.1 × 8.8mm resin case and lightweight 26g construction. The green case is paired with a green bio-based resin band featuring a vented design, while resin glass protects the digital display. The watch is water resistant and accommodates wrists from 145mm to 215mm.

Smartphone Connectivity & Step Tracker

Bluetooth® Mobile Link connects the watch to the CASIO WATCHES app, providing automatic time adjustment, easy watch setting and access to approximately 300 world time cities. A built-in sensor automatically measures steps, with the LCD displaying the daily total, progress towards a selected step goal and an hourly step-count graph. The app also supports life log data, time and place recording and a phone finder function.

Digital Functions & Battery

The F-B100W-3AEF provides dual time, a 1/100-second stopwatch with memory for up to 200 lap or split-time records, a 60-minute countdown timer and five daily alarms. An LED green backlight offers selectable illumination duration and afterglow, while the full auto-calendar runs to 2099. Powered by a CR2016 battery, it provides approximately two years of battery life and an accuracy of ±15 seconds per month when the Mobile Link function is not being used.

Operation Guide