No good deed goes unpunished. Josh Centers bought an Apple Watch for a relative who had heart surgery but ended up spending many hours getting it set up.

For users in Hong Kong and many European countries, watchOS 5.2 makes the Apple Watch Series 4’s ECG and irregular heart rhythm monitoring features available. It also supports the new AirPods and adds RTT for phone calls.

Apple announced in September that its new Apple Watch Series 4 is capable of taking electrocardiogram readings as part of its health-monitoring features. That feature didn’t ship with the watch, but it’s now available to users in the US with the watchOS 5.1.2 update, along with irregular heart rhythm monitoring on all supported Apple Watch models.

The Apple Watch Series 4 promises to detect falls, identify atrial fibrillation, and let wearers take electrocardiograms on demand. Rich Mogull draws on his paramedic training to evaluate how effective each of these technologies is likely to be.