Bought an Apple Watch series 6. There was no clear indication that the watch was no longer waterproof. One of its functions is to monitor your swimming. There was no indication that the product add lost functionally. The opposite is advertised. During swimming, the watch start to wrongly indicate that was exposed to high temperatures, and enter into safe mode. Sometimes it took days to recover. Meanwhile, battery lost a lot of autonomy, it does not last a day, not even close. The instructions to use warranty say it does not matter if it is supposedly waterproof or not, because it was open by the seller to be refurbished. So I paid for a product that does not work as it was supposed.