The Oura Ring 4 is a sleek and advanced activity tracker designed for unisex adults. With a display resolution of 240 x 240 and a 2.4X external display size, it provides detailed information on your activities. Its battery life lasts up to 7 days, making it convenient for long-term use. The ring is powered by batteries and comes in a stealth color, perfect for those who prefer a subtle look. Made by the brand Oura, this activity tracker is a reliable and stylish accessory for tracking your fitness goals.