SAUNA WATCH SAN-100H-1BJR Case size (H x W x D) 40.2 × 35.4 × 12.9 mm Weight 25 g Case/Bezel Material Resin Band Resin Water Resistance 5-bar water resistance Power Supply/Battery Life Battery life: Approx. 5 years Accuracy Average monthly difference: ±15 seconds Other Usable environment: Sauna up to 100°C (use within 15 minutes while wearing on wrist) Glass Mineral Glass Band Attachment Size Free Shipping will take a little time. This is the "SAUNA WATCH," a wristwatch for sauna enthusiasts. It features unique functions and design for safe use even in high heat and humidity. You can switch between sauna mode and normal time mode with the push of a button. Even those who lose track of time in the sauna can easily use the 12-minute timer in sauna mode. Also, the simple dial and luminous hands allow you to check the time even in a dark sauna room. It has heat and moisture resistance and can be worn safely in saunas below 100°C. The heat-resistant battery makes it difficult for heat to reach the internal components that are sensitive to heat. In addition, resin is used for the exterior parts to avoid burns, and the only metal screw is designed not to touch the skin. Resin that is resistant to moisture is used to prevent the inside of the watch from fogging up. The curl band, inspired by sauna locker keys, allows you to subtly feel the sauna even in everyday life. *The duration and brightness of the luminous paint vary depending on the intensity and duration of the light absorbed. *Fogging may occur if the watch is rapidly cooled after entering the sauna, but this is not a malfunction if it disappears within a few minutes. *Please refrain from using in high-temperature environments other than saunas. Also, please use it within 15 minutes while wearing it on your wrist, even in a sauna.