The Oura smart ring is designed specifically for health management and supports Bluetooth connectivity. - Brand: Oura - Accessories: Charging cable - Bluetooth compatible: Yes - Contents: Smart ring, charging dock, USB cable - Design: Black - Size: 06 Thank you for viewing. I opened it to charge it, but I never used it, so I'm selling it. The box is also in good condition. The size is small, so it's recommended for women.