I purchased these around June and used them for about six months, but I'm selling them because I lost the charging case. Please be aware that there are stains, scratches, and signs of wear and tear as I actually used them. I would appreciate it if you could consider them as parts for replacement. I think they should still work, but I haven't been able to confirm their operation because I lost the case a month ago and haven't been able to charge them. Therefore, returns are not accepted for any reason. If you are okay with this, I look forward to your purchase.