I am leaving a review after 4 days of use. 🌚 Honestly, this item exceeded my expectations. Firstly, the appearance and material of the ring definitely don't look like something worth 23€; this incredible pink color has won my heart! Secondly, the app in Ukrainian is very pleasant and convenient to use. The app itself is high-quality, intuitive, and easy to use. Of course, I can't be 100% sure about the accuracy of all measurements, but as far as sleep is concerned, the ring clearly shows the sleep and wake times, so I hope that everything else works correctly as well :) I wear size 7 on my ring finger, I know that the manufacturer recommends wearing it on the index/middle/ring finger, but it was more comfortable for me on the ring finger. The ring is water-resistant - I can easily wash my hands with it on, but when I go to the shower, I take it off, just in case it gets washed down the drain :)) Overall, I can only recommend this product and the seller; it's also a great gift for a close person.