The Oura Ring Gen 4 in Ceramic Midnight, Size 7 is a sleek and advanced activity tracker designed for both indoor and outdoor use. This unisex ring from Oura brand offers a high-resolution display with a resolution of 240 x 240, providing accurate heart rate measurements and sleep tracking features. With a battery life of up to 7 days, this ring is equipped with sensors such as accelerometer and GPS, making it ideal for running and jogging activities. The midnight blue color and ceramic finish add a stylish touch to this fitness technology device, which is compatible with both iOS and Android operating systems. Made in the United States