I bought 2 of these rings in December 2024, by the end of December 2025, just after warranty expiration, started having trouble with charging. Now one stopped tracking sleep and needed to be charged daily or it died. I have purchased numerous Samsung products and always been happy with them, but this ring is a huge dissapointment. It is basically a disposible item, throw away when it stops working. In my case just over a year. Not a good investment. I will say that when it did work I found it to be quite accurate.