Oura ring is a type of wearable device that measures certain things about your body and relays this information to you in the hope that you will find it useful. What Oura ring measures is your heart rate (using infrared lights on the inside of the ring to see your blood pulse), your heart rate variability (the time between heartbeats and how it varies over time), and your skin temperature. It also keeps track of your steps, estimates the calories you burn, and furnishes its accompanying app with all kinds of bells and whistles like your “readiness” score and information on your sleep patterns. The Oura ring was not designed to predict illness but in the midst of this pandemic it is now being used as such. The Oura ring's high accuracy in monitoring a person's biomedical signals might enable a prediction of a COVID-19 infection two to three days before symptoms appear.