【Long Battery Life + Charging Case】Our smart ring comes with 7days long battery life, and it comes with a Charging Box which can charge the ring with 12times. If your charging box and ring both full charged, then you don't need more charging for about 34days, and this will ensure you to handle your body situation always for business traveler or outdoor enthusiast. 【All‑In‑One Health & Fitness Tracking】High-precision sensors automatically monitor heart rate, SpO2, skin temperature, sleep quality, steps, distance, calories burned and activity score. Supports walking, running, cycling and more sports modes, helping you build a healthier, more active lifestyle. 【Hand Gesture Remote Control】Simply enable AssistiveTouch to control your phone with easy finger gestures: scroll TikTok, play/pause music, take photos—no need to touch your screen. A convenient, fun hands-free experience for daily use and outdoor activities. 【50ft Waterproof & Comfortable Wear】IP50 waterproof (50ft) design allows safe wearing while washing hands, running in rain, or daily sweating. The slim, curved, lightweight design fits comfortably all day long—like wearing a stylish ring, not a bulky tracker. 【Women’s Health Tracking & Important Size Note】Accurate menstrual & ovulation reminders based on temperature and cycle data for better women’s health management. ✅ IMPORTANT: This ring uses US standard ring sizes (#8–#13). Please confirm your size before ordering; use our sizing kit for the best fit. Please go to 'Store' and order the kit from TK5 model listing. 【Size Before You Buy】The Smart Ring follows US ring sizing standards. If you know your US ring size, simply order the same size for a good fit. If you’re unsure of your size, we recommend getting our Sizing Kit to find your comfort size, please go to 'Store' and order the kit from TK5 model listing.