A three-year-old startup says it has produced a smart ring that can track blood pressure as accurately as a traditional arm cuff and that — eventually — it could be able to make medical diagnoses. If the company, called Vital Signals, can successfully deliver on the promise, it would represent a significant breakthrough in consumer wearables.

The Google Home Speaker is the first new device of its kind to come from Alphabet Inc. in six years. In that time, Google has reshaped itself as an industry leader in artificial intelligence, with its Gemini platform now ubiquitous across consumer hardware like smartphones and web services like Search, Workspace and YouTube.