The Oura Ring Generation 3 Horizon Activity Tracker in silver is a high-tech fitness tracker designed for both indoor and outdoor activities. Made from titanium material, this unisex activity tracker provides accurate heart rate and distance measurements, as well as tracking sleep and temperature. It has a battery life of up to 7 days and is water-resistant, making it perfect for activities like gym training, swimming, and running. The Oura Ring also features infrared and SpO2 sensors for added monitoring capabilities. Compatible with both iOS and Android operating systems, this activity tracker is a must-have for anyone looking to track their fitness and overall health.