&quot;It also happened recently with Fitbit, the maker of wearable activity trackers. The company was hit with a class-action lawsuit in San Francisco asserting that the wristbands failed to “consistently and accurately record wearers’ heart rates,” which is vital for those with certain medical conditions.&quot;<p>Apropos of anything else - I don&#x27;t think Fitbit has ever tried to market itself as a medical device.