Ultrahuman - Ring Air - Smartring - Unisexe - Raw Titanium - Taille 63 (Ø 20 mm)

yes , it is excellent when you are looking for your ring size

A very useful tool to have if you are wanting to buy an Ultrahuman Ring Air anytime soon

Received product Did not work / turn on / charge No serial number or paperwork in box Unfortunately returned.

Although the ring sizing kit is super innovative and I had no issues with the sizing kit, I would advise you to not invest in the Ultrahuman products as the smart rings are more deffective than they are working. On the off chance that you get a ring that works out of the box, doing research and through personal experience it stops working for most users and they have to get replacements.

The ring size was not good. The battery did not last very long. Looking at online reviews, there were a lot of issues with build quality and battery life. Thankful for the excellent Costco policy on returns.