Oura Horizon Ring goes on sale for the first time on Amazon Prime Day, offering up to 19% off.

The Oura Horizon Ring, a popular smart health tracker, is on sale for the first time ever on Amazon Prime Day, offering up to 19% off the device from July 16 to 17. The Oura Ring Gen 3 has gained praise for its health-tracking capabilities and insights into women's health, and it rarely goes on sale. Prime Day's discount brings the price down to the lowest it has ever been on Amazon.