Casio F-B100W step-tracker watch sells out in one day in Japan — F-91W design for ¥8,800

Casio's latest budget offering, the F-B100W with a step counter and Bluetooth, sold out on its launch day in Japan. The device went on open sale on August 7, and by evening the company's own online store had no stock left.

The reason for the rush is clear: at ¥8,800 (about $55), it is one of the cheapest Casio watches ever shipped with a step tracker and Bluetooth. The case echoes the rectangular silhouette of the iconic F-91W, currently priced at $22 on Amazon. A familiar design paired with added connectivity and a practical daily feature drew a massive queue.

Inside the F-B100W, an accelerometer counts steps and shows the daily total on the LCD, while Bluetooth handles automatic time correction and pushes step data to the Casio app for basic activity logging. There is no heart-rate sensor, no GPS, and no display other than the standard segmented panel. The case measures 41.9 × 38.1 × 8.8 mm and weighs 26 grams, with a slitted biomass-plastic band. Battery life is quoted at roughly two years.

All three colorways — F-B100W-1AJF, -1BJF and -3AJF — were available from the morning and gone within hours. Differences are mainly in contrast: a black case with a positive LCD and retro blue, red and yellow accents for the first, an all-black version with a negative display and gray text for the second, and a muted green finish with turquoise highlights for the third.

Those who missed the window are not entirely out of luck: several Japanese third-party retailers still list stock, though pricing varies — some listings are above Casio's official figure, while others are marked down. Casio has not given a restock date or confirmed any plans to sell the F-B100W outside Japan. Even if an international launch happens, Japanese pricing rarely translates cleanly to US or European retail.