The Circular Ring 2 Silver Size 13 is a new in box activity tracker that offers a variety of features for fitness enthusiasts. It operates on batteries with a battery life of more than 7 days and provides heart rate monitoring, GPS tracking, and a sleep tracker. The device is compatible with both Windows and macOS operating systems, and includes functions such as an alarm, calorie monitor, and ECG heart rate monitoring. Made of metal and featuring Bluetooth connectivity, this unisex adults' fitness technology is suitable for a range of indoor and outdoor activities like gym workouts, swimming, yoga, and running.