In the past few years, we have seen plenty of clever smart rings that can track your health and daily activity. The FemTek BBRing is focused on menstrual health. The Basal Body Ring can track your basal temperature, heart rate, SpO2 and heart rate variability. It collects all the data at night and syncs it to your smartphone.
The BBRing takes up to 15000 measurements of your skin overnight. It has a dual sensor design to account for changes in room temperature. The companion app offers ovulation predictions. It offers recommendations based on your cycle. The battery life lasts up to 2 full nights of sleep.[where to get it]