Check the listing for details. Milavan Ring 2.0 Smart Ring Fitness Tracker Size 7 Black New. Color: Black, Condition: New other (see details), Made in China. Listed at 24.99 USD. The Milavan Ring 2.0 Smart Ring Fitness Tracker is a sleek and high-tech device designed for fitness enthusiasts. This smart ring is powered by batteries and made of metal, making it durable and long-lasting. With features like heart rate monitoring, GPS tracking, and Bluetooth connectivity, this activity tracker is perfect for indoor and outdoor workouts, particularly for running and jogging. Its battery life ranges from 5-7 days for regular use and up to 15 days on standby. The ring is compatible with Android and iOS devices and comes with a 1-month manufacturer warranty. The black color and unisex design make it a stylish and versatile accessory for anyone looking to track their fitness progress.