Pulse Oximeter vs SpO2 monitor in Smartwatches: Blood Oxygen Track Reliability, Which One Should You Buy in COVID-19 times, Should you rely on smartwatches to measure blood oxygen,
Samsung launches Health Monitor app in SG, bringing SpO2 tracking to Galaxy Watch3 (updated) - HardwareZone.com.sg
Smartwatch SoundPEATS Watch 2, SpO2 Fitness Tracker with 12 Sports Modes Heart Rate Sleep Quality Monitor IP68 Waterproof, Smart Watches Compatible with iPhone Android Phones Smart Watch for Men Women: Buy Online
Oximeter vs Smartwatch: Can Wearables Track Blood Oxygen Reliably and Which One Should You Buy? - News18
Active2 has red light, SpO2 capable : r/GalaxyWatch
Samsung finally enables blood pressure monitoring on the Galaxy Watch Active 2; functionality teased for the Galaxy Watch 3 too - NotebookCheck.net News
Samsung Galaxy Watch 4 44mm Smartwatch, 1.36" AMOLED Display, Up to 40H Battery Life, Bluetooth & Wi-Fi Connectivity, ECG, SpO2 & BIA Measure Sensors, Intl Version, Silver | SM-R870NZSALTA Buy, Best Price
Google Pixel Watch gains support for SpO2 (blood oxygen saturation) tracking