The FDA clearance allows the W1 wearable to be sold for both over-the-counter and prescription use—making it the first SpO2-tracking smartwatch to carry both indications in the U.S., per Masimo.

Apple's banned SpO2 data isn't especially accurate, and most rival watches aren't any better. Masimo could change the status quo. When you purchase through links on our site, we may earn an affiliate ...