How does SpO2 onCharge 4 work/look?

lorib642

I have an Inspire 2, but my dog bit it and cracked the screen, so it is no longer water resistant. It still works. I contacted Fitbit and it is not covered but they offered a discount for a new Fitbit. I was looking at Charge 4. I have sleep apnea which I wear a device for,but am wondering how low my SpO2 goes down at night. Does it just give an average reading? Does it show on the app? Does it disappear when you sleep more? I like the Inspire 2 and may just replace it instead. Thanks