Casio Timeless 38mm Digital Resin Quartz Watch F-B100W-1AEF

The Casio Timeless F-B100W-1AEF features a slim resin case measuring 41.9 × 38.1 × 8.8mm and weighing 26g. The black case is paired with a black bio-based resin band and resin glass, while the digital LCD provides a multifunction display. The band has a vented design and accommodates wrists from 145mm to 215mm, with water resistance providing practical protection for everyday wear.

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 counts steps, with the LCD showing daily step totals, progress towards a selected goal and an hourly step-count graph. The app can also record life log data, time and place information, and includes a phone finder function.

Digital Functions & Battery

The F-B100W-1AEF includes dual time, a 1/100-second stopwatch with memory for up to 200 recorded lap or split times, a 60-minute countdown timer and five daily alarms. An LED backlight with selectable illumination duration and afterglow provides visibility in low light, while the full auto-calendar runs to 2099. Powered by a CR2016 battery, the watch has an approximate two-year battery life, with an accuracy of ±15 seconds per month when the Mobile Link function is not being used.

Operation Guide