Apple Watch 4's ECG feature is rolling out today | Engadget Today The Apple Watch 4 stole the show at the Apple event in September, in large part due to its built-in electrocardiogram (ECG). The smartwatch was touted as the first consumer device to pack the function -- which goes one further from detecting a low heart rate to sense a dangerous condition known as an atrial fibrillation. Fast forward almost three months, and The Verge reports that the feature is available today courtesy of the latest watchOS update (5.1.2.), along with an irregular rate notification feature for Apple Watches going back to Series 1. Read more: https://ift.tt/2Qeisb8 Subscribe to Engadget on YouTube: http://engt.co/subscribe Engadget's Buyer's Guide: https://ift.tt/2COn5Sn Get More Engadget: • Like us on Facebook: https://ift.tt/1k1iCZT • Follow us on Twitter: http://www.twitter.com/engadget • Follow us on Instagram: https://ift.tt/1k1iCZV • Read more: http://www.engadget.com Engadget is the o...