Pixel Watch's most important update yet is finally rolling out in the US

The Pixel Watch 3 is getting a first-of-its-kind, potentially life-saving feature, and users will see it starting on Tuesday. 

The FDA-cleared Loss of Pulse Detection feature works by tracking your heartbeat. If your heart stops beating -- due to cardiac arrest, respiratory or circulatory failure, overdose, or poisoning -- your watch will automatically turn on more accurate infrared LEDs and look for motion data. To use the feature, watch users must manually opt-in to the feature through the Google Pixel Watch App, then select Safety and Emergency and hit Loss of Pulse Detection to enable. 

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If the watch determines you're not responsive, it will start a countdown and audio alarm. If you still don't respond, the watch will place a call to emergency services using your LTE or phone connection, inform them that ...