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Loss of Pulse Detection combines signals from Pixel Watch 3\u2019s sensors, AI and signal-processing algorithms to detect loss of pulse events, with a thoughtful design \u2014 built from user research \u2014 to limit false alarms. The feature uses signals from the Pixel Watch 3\u2019s existing Heart Rate sensor, which uses green light to check for a user\u2019s pulse.<\/p>\n
If the feature detects signs of pulselessness, infrared and red lights also turn on, looking for additional signs of a pulse, while the motion sensor starts to look for movement. An AI-based algorithm brings together the pulse and movement signals to confirm a loss of pulse event, and if so, triggers a check-in to see if you respond.<\/p>\n
The check-in asks if you\u2019re OK while also looking for motion. If you don\u2019t respond and no motion is detected, it escalates to an audio alarm and countdown. If you don\u2019t respond to the countdown, the LTE watch or phone your watch is connected to automatically places a call to emergency services, and shares an automated message that no pulse is detected along with your location.<\/p>\n
Our goal is to make a difference and contribute towards saving lives. While loss of Pulse Detection won\u2019t detect every loss of pulse event, we believe it can make a meaningful difference, providing help when it counts most to people and their loved ones.<\/p>\n
Loss of Pulse Detection will be available on Pixel Watch 3 in September in various countries in Europe, including the U.K., France, Austria, Denmark, Ireland, the Netherlands, Norway, Sweden and Switzerland. We\u2019ll continue working with regulatory bodies to make the feature available in more countries.<\/p>\n
Our goal has been to build a potentially life-saving feature, and to develop it responsibly. Because loss of pulse events are timely but relatively rare emergencies, they can\u2019t easily be observed, reproduced and tested in real-world settings. We had to find other ways to collect enough data to develop the feature to detect true loss of pulse events.<\/p>\n<\/div>\n