Can Apple watch really save lives? Here's how it works

After reports of an Apple Watch automatically calling emergency services and helping save a man's life in the US, MO spoke to a tech journalist to understand how the feature actually works. From ECG and heart rate sensors to crash and fall detection, here's how Apple Watch detects medical emergencies, why the system is more effective in the US than in India, and whether this technology has the potential to transform emergency healthcare in the future.