Bests & Worsts Reviews from Amazon

I purchased this product to monitor my sleep quality because I suspected I had Sleep Apnea. I also have a finger clip type Oximeter to check the accuracy of this sensor. Long story short: the Wellue ring is accurate in the pulse rate. However, the SPO2 is off by 5-7%. It can still detect that I have many drops of SPO2 during my sleep, but the numbers are not accurate measured. I really liked the product but this inaccuracy killed it for me.