The Muse Ring One Smart Ring Titanium & Ceramic Black Size 12 is a sleek and stylish activity tracker designed for fitness enthusiasts. With a durable titanium and ceramic construction, this ring provides accurate heart rate monitoring and NFC payment capabilities. It has a rechargeable battery with a battery life of up to 7 days and can be used indoors or outdoors for running and jogging activities. The ring is compatible with both iOS and Android operating systems and comes with a 1-year manufacturer warranty. Perfect for both men and women, this smart ring is an essential tool for tracking your health and fitness goals.