The ODO Smart Ring 3 in BLACK is a sleek and stylish activity tracker ring designed for both indoor and outdoor use. With a display resolution of 240 x 240, this smart ring provides accurate heart rate measurements and has a battery life of up to 7 days. Made of stainless steel, it is durable and resistant to wear and tear. Compatible with both iOS and Android operating systems, this smart ring is perfect for those who enjoy activities like gym workouts and running. With Bluetooth connectivity and a 1-year manufacturer warranty, the ODO Smart Ring 3 is a reliable and convenient tool for tracking your fitness progress.