Check the listing for details. Sleep tracking Motion monitoring Smart ring compatible with iPhone and Android. Color: Black, Condition: New. Listed at 25.00 USD. The smart ring is a stylish and functional activity tracker compatible with both iPhone and Android devices. Made of stainless steel, it is powered by batteries with a battery life of up to 7 days. The ring provides a variety of measurements including heart rate, time, calories, and distance, and is equipped with features such as multi-sport tracking, wireless connectivity, temperature monitoring, and a sleep tracker. It is designed for both indoor and outdoor activities, making it a versatile tool for fitness enthusiasts engaged in gym training, weight lifting, swimming, yoga, and running. With its sleek design and advanced sensors like Infrared and GPS, this smart ring is a must-have for those looking to track their fitness progress accurately.