Putting this technology in a consumer wearable has never been more important given the global COVID-19 pandemic, as it indicates how well your circulatory and respiratory systems are delivering oxygenated blood to your body, and can help you gauge whether a hospital visit is necessary.

The first time I used this feature, the Series 6 said my blood oxygen saturation level was 99 percent. Charge times are from 0–80% and 0–100% using the included Apple Watch Magnetic Fast Charging USB-C Cable. Apple’s carbon intensity of key materials as of 2015 (our baseline year for our 2030 product carbon neutrality goal).Case and band combinations can be made within collections (Apple Watch and Apple Watch Hermès) only.

The Apple Watch has been our longstanding Editors' Choice for its excellent performance, unparalleled app selection, and ample health and fitness tracking features. The Series 6 comes partially charged, and as soon as you take it out of the box and turn it on, a screen will appear on your iPhone asking if you want to set the watch up for yourself or someone else using Apple's new Family Setup service. On the inside, the Series 6 features 32GB of storage and Apple's new dual-core S6 System in Package (SiP), which it says delivers up to 20 percent faster performance than the S5 chip in the Series 5 and Watch SE.This isn't such a novel feature, as several other fitness trackers and smartwatches can measure your SpO2 level, including the Garmin Vivoactive 4, Samsung Galaxy Watch3, and Fitbit Sense.