OURA Sleep tracking ring

The new Oura Ring monitors your heart rate around the clock, giving you the insights you need to make the most out of your days and nights. That is why I decided to have it as a modern wedding ring. 
Oura ring is very respected in bio-hacking community . The study found Oura ring have a high accuracy (96%) to detect just when the user is sleeping, an accuracy of 57% to detect all the sleep stages when only its accelerometer sensor was used, improving up to 79% when all of its sensor functions were combined. 
People were looking to buy it - it says referring a friend you can get 
If you use my link you can get 50usd off your order!