Note Before purchasing the product, please use a tape measure to measure the circumference of the finger on which you want to wear the ring. So that you can choose the smart ring that suits your finger. Please refer to the product size chart to choose the most suitable size for you. Note Please download APP firstly, and bind the Smart Ring, Do not use the mobile phone Bluetooth to directly link the Smart Ring. If it is already connected, please delete the matched Smart Ring from the mobile phone Bluetooth matching device. 1.The principle of wearable device measurement is completely different from that of medical equipment. It is only for sports and fitness reference, thank you. 2.Charge for 3 hours when using for the first time.（The Smart Ring may run out of power during long-term transportation. ） 3.Please download the APP before use（The language of the Smart Ring need to be connected to the APP to synchronize） 4.The Smart Ring only supports life waterproofing, you cannot wear the watch for bathing or swimming. Do not soak the Smart Ring in hot water. 1> Daily activities: Step count, distance, calorie calculation 2> Health management: heart rate measurement, blood oxygen saturation, sleep tracking, multiple exercise modes, stress, heart rate variability 3> Touch function: single point switching display function 4> Display: time, steps, heart rate, battery level, likes count 5> Other functions: remote control for taking photos, searching for rings, gesture control, gaming, female cycle 6》Step count, sleep, heart rate, exercise data recording Supported languages: Danish, Ukrainian, Russian, Croatian, Hungarian, Hindi, Indonesian, Türkiye, Hebrew, Greek, German, Italian, Latvian, Czech, Slovak, Slovenian, Japanese, French, Polish, Thai, Estonian, Swedish, Lithuanian, Simplified Chinese, Traditional Chinese, Romanian, English, Dutch, Portuguese, Spanish, Vietnamese, Arabic, Korean, Malay packing  1X Smart Ring  1X charging cable  1X instruction manual