Fitbit has released its SpO2 watch face for Fitbit Versa and Ionic devices, which lets users get in touch with their blood oxygen levels. The feature was actually part of the Fitbit Sense and Versa 3 ...

is a senior reporter and author of the Optimizer newsletter. She has more than 13 years of experience reporting on wearables, health tech, and more. Before coming to The Verge, she worked for Gizmodo ...

Scroll to section What is SpO2? How is SpO2 measured? Why is SpO2 important? You might like If your smartwatch is capable of measuring your SpO2, you may be wondering what that is and why it’s ...