X7 Ring by J-style with CALERA® technology

Designed with simplicity and precision in mind, the J-Style X7 Ring delivers continuous core body temperature tracking in an elegant ring form. Powered by CALERA® technology, measurements are taken directly from the finger. Core body temperature is an important signal of overall health. Tracking it continuously can help users notice early signs of illness, understand recovery, improve sleep habits, and support women’s health.

The ring functions automatically throughout the day and night, monitoring temperature across activity, rest, and sleep without any user interaction.

CALERA® is a complete solution for continuous core body temperature monitoring, designed for use in wearables and health technology applications.

The CALERA® solution is also available as a white-label product, ready for integration in MedTech, sports, and occupational health devices, making it adaptable for a wide range of applications beyond the X7 Ring.

1. Continuous temperature tracking: Monitor core body temperature throughout the day and night, not just at one moment in time.
2. Clear health insights: Better understanding on how your body responds to activity, rest, stress, and recovery.
3. Comfortable everyday design: Lightweight and ergonomic for all-day and overnight wear.
4. Trusted Swiss sensor technology: Powered by greenteg’s proven and validated CALERA® technology.
5. Future-ready platform: Designed to support future health features and integrations.

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