- Battery life and charging case: 7 days of battery life and a charging box that can charge the ring 12 times. When both are fully charged, you can go about 30 days without charging, ideal for business travelers or outdoor enthusiasts. - IP68 waterproof up to 50 meters: wear the ring while washing hands, showering, swimming, or hiking in the rain without removing it, so you can monitor your health data anytime, anywhere. - Health monitoring: equipped with a high-precision heart rate sensor to monitor heart rate, sleep quality, skin temperature, and more. - Multi-exercise modes and fitness tracker: tracks steps, distance walked, and calories burned. Exercise modes include walking, running, and cycling, with activity scoring to encourage a more active lifestyle. - Confirm size before purchase: refer to the size chart in the images to choose the appropriate size. Note that the smart ring is intended for everyday health monitoring and is NOT a substitute for professional medical devices. - Free app: the smart ring app is free with no subscription. The device supports Android 5.1 and iOS 8.0 or above.