An SpO2 sensor can be nice to have but it's useless to most people. A healthy person near sea level will always have an SpO2 near 100%. It's only really useful to people with medical conditions like sleep apnea, or athletes at high altitude. And even then you won't be able to get continuous monitoring. Current wrist SpO2 sensors require the wearer to hold still for a while in order to get an accurate reading.
I turned mine off to save battery life.