Amazon.com: Fitbit Sense Health & Fitness Smartwatch W/ GPS, Bluetooth Call/Text, Heart Rate SpO2, ECG, Skin Temperature & Stress Sensing (S & L Bands, 90 Day Premium Included) International Version (Graphite) :
Fitbit Sense, Versa 3 & 2 - Now has SpO2! - YouTube
Amazon.com: Fitbit Sense 2 Advanced Health and Fitness Smartwatch with Tools to Manage Stress and Sleep, ECG App, SpO2, 24/7 Heart Rate and GPS, Lunar White/Platinum, One Size (S & L Bands
Track Your SpO2 to Uncover Changes in Your Wellbeing - Fitbit Blog
Fitbit Charge 4 update now shows blood oxygen level on your wrist | Tom's Guide
Fitbit releases a special update to help you check your oxygen saturation levels | TechRadar
Fitbit Charge 4 update shows SpO2 data on the band itself, tracks skin temperature - GSMArena.com news
Overnight spO2 is Interesting but why is it not displayed in the app? So you can see changes over time... : r/fitbit