The YOR Smart Ring Delux Activity Tracker in Size 6 Silver is a stylish and functional fitness technology device that allows users to track their heart rate and distance. Made of durable metal, this activity tracker is suitable for both indoor and outdoor activities, and is compatible with iOS and Android operating systems. With features such as a sleep tracker and water resistance, this YOR Smart Ring Delux is perfect for those looking to monitor their fitness progress in a convenient and discreet way. The included portable charging case ensures that the device is always ready to use.