Sauna Mode ⇄ Timekeeping Mode
Easily switch between Sauna Mode and Timekeeping Mode with a single button.
Even if you forget when you entered the sauna, just press the button to reset the timer to 0:00 — so you can relax and enjoy your session without checking the time.

Sauna-Friendly Dial
A simple, easy-to-read dial with luminous hands for dim sauna environments.
No need to remember when you started — your personal 12-minute timer is always on your wrist for peace of mind!

Note: The brightness and duration of the luminous glow may vary depending on the amount and intensity of light absorbed.

Sauna-Specific Heat-Resistant Design
Designed specifically for sauna use, this watch uses a heat-resistant battery newly adopted by CASIO.
Its internal structure minimizes heat transfer to key components, ensuring stable operation even in high-temperature environments.

Thoughtfully Designed Exterior Components
To prevent burns, all exterior parts are made of resin — avoiding metal components wherever possible.
The only metal screw is positioned on the case back, and the case is carefully shaped to minimize direct skin contact.
Additionally, a low-moisture-permeable resin is used to help reduce internal fogging, ensuring safe and comfortable use even in demanding sauna conditions.

Note: While the design helps reduce fogging, it does not completely eliminate it. If the watch is rapidly cooled after a sauna session, some fogging may occur but should clear within a few minutes and is not considered a defect.