**MISSING LID TO BOX** **ITEM IS NEW IN BOX** Make Fertility Tracking Easy - Only need to wear it on your finger to monitor your fertility temperature in real-time, the APP automatically synchronizes the data and generates customized fertility charts, predicts menstruation and ovulation to help you prepare for pregnancy and manage your period more scientifically. High Accuracy & Comfort - Upgraded multiple temperature sensors, make the temperature measurement is more accurate. Just 2.7mm thickness. The inner ring material is upgraded, the premium ceramic exterior with aluminum core ensures durability. Professional Sleep Insights - The new version of the sleep algorithm, you will have an in-depth understanding of your sleep condition and the changes in each stage, then get detailed sleep scores and personalized recommendations. How to Download APP - For Android users, please search and download "Femometer Connect". For i0S users, please search and download "femometer".