Revised Version:
Stay comfortable day and night with this ultra-slim smart ring (just 2mm thick!), perfect for workouts or sleep. Before buying, measure your finger for a flawless fit. Compatible with Android 5.0+ and iOS 9.0+.
Keep proactive tabs on your well-being: The advanced 4.0 sensor automatically tracks heart rate, blood oxygen, and stress every 30 minutes. Understand your sleep like never before—view deep, light, and REM cycles plus nighttime awakenings to wake up truly refreshed.
Whether running, cycling, or hiking, it records exercise time, steps, calories, and even GPS routes. Charge it in 1-2 hours for 3-5 days of use. Share health insights with loved ones or snap photos remotely—all from your finger.
(Note: Combined redundant terms like “health rings for women/men” into inclusive language, streamlined technical details, and enhanced flow for natural readability.)