these devices tend to have easily a 2-3 year lifespan before the battery starts to fade 10-15%..or damage.. with this benefit it probably means a new Ring is available every 1.5-2 years (their new rings tend to come about 2-2.5 yrs on avg) and then just ebay or sell or gift the old ring to someone else. It’s an interesting benefit and I’d like to see more of it.. maybe they will put Eight Sleep on the docket at some point or other wellness products.