Apple has released watchOS 5.1.2 to the Public just one day after releasing iOS 12.1.1, this update includes seven new Infograph complications for key Apple apps, and a Control Center toggle for Walkie-Talkie. The 5.1.2 update will also include irregular heart rate notifications for Apple Watch Series 1 through Series 4 and the all new ECG app for Apple Watch series 4 users in the US.

To take an ECG, users simply place their finger on the digital crown and wait for 30 seconds whilst the Watch scans the electrical impulses in your finger. You must be dry, sitting or standing still, and able to hold your hands in place for 30 seconds

The US Centers for Disease Control and Prevention estimates that as many as 6.1 million Americans are living with a-fib, and that number is only expected to increase as the population grows older. Apple’s hope is that with the single-lead ECG available anytime you are wearing your watch, you have a better chance at screening for atrial fibrillation at the time it is happening.