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Aloha, thank you for taking the opportunity to ask us your question about the Samsung Galaxy Watch8. Yes, the Galaxy Watch8 monitors blood oxygen and heart rate using advanced optical sensors, offering both on-demand and automatic tracking to measure fitness levels, sleep stages, and heart health. It features FDA/regulatory-registered technology for Irregular Heart Rhythm Notifications (IHRN), ECG, and blood pressure monitoring. If you have any other questions for us, please feel free to reach out to Support. Thank you for being a faithful Samsung customer. - Debra
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