The Oura Ring Gen 4 Ceramic Cloud/White in size 7 is an activity tracker designed for unisex adults who engage in running and jogging. With a display resolution of 240 x 240, this ring provides heart rate measurements and sleep tracking features thanks to its accelerometer sensor. It has a battery life of up to 7 days and is powered by batteries. The sleek white color and ceramic construction make it suitable for both indoor and outdoor use. Made by Oura in Estonia, this ring is compatible with Android operating systems and comes with a 1-year manufacturer warranty.