The Oura Ring 4 Ceramic in Cloud White, Size 8 is an activity tracker that provides accurate heart rate and calorie measurements. Powered by batteries and featuring a display resolution of 240 x 240, this unit is suitable for both indoor and outdoor use. Its titanium material and Bluetooth connectivity make it a versatile option forfitness enthusiasts, whether they are into yoga, running, or jogging. With a battery life of up to 7 days and a manufacturer warranty of 1 year, the Oura Ring 4 Ceramic is a reliable and stylish accessory for unisex adults looking to track their fitness progress.