The Oura smart ring measures users' resting heart rate during sleep and rest by detecting changes in Blood Pulse Volume (PPG). The measurements are done from the arteries on the palm side of the finger using two infrared LEDs.
Oura is a pioneering sleep performance platform, focused on improving sleep that leads to a better life. The Oura Ring and app gives users daily feedback to improve their health, allowing users to better understand their body and reach their goals. Oura Health OyLtd. is a health technology company founded in Oulu, Finland in 2013. In 2018, the company received the Red Dot Awards for communications design and product design. Backed by world-class investors, leaders, champions, and creators, Oura Health is based in Oulu & Helsinki, Finland, and San Francisco, California.