Most high-end smartwatches have a heart rate sensor. Many double as fitness trackers and some even focus on health over notifications, but they can’t act on their own in an emergency. If you find yourself having a cardiac event such as a heart attack, the Heart Watch will proactively step in. Unlike the heart rate monitors on conventional smartwatches, the Heart Watch has more comprehensive, medical-grade sensors that continuously monitor your heart rate, blood flow and oxygen levels. If an anomaly is detected, several things can be set in motion via the watch. Time is critical during cardiac arrest and minutes can mean everything, and if you’re alone, the Heart Watch can save your life. Let’s take a closer look at everything the Heart Watch can do (and a few things it can’t).