The Gold SMART RING Size 9 Health and Fitness Tracker is a stylish and functional accessory for unisex adults. Made of stainless steel, this ACTIVITY TRACKER features a HEART RATE MONITORand SLEEP TRACKER, making it perfect for tracking your fitness goals. With Bluetooth connectivity and compatibility with both iOS and Android operating systems, this ring allows you to monitor your health and performance indoors or outdoors. The INCLUDED mobile charging case ensures that you can keep your ring powered up and ready to use at all times.