With completely wireless earbuds, the rule is: when the battery fails, they have to be disposed of. Not so with the Fairbuds, that allow you to replace batteries in just a few seconds. Combined with a repairable design, the earbuds should therefore have an extremely long lifetime.
I don’t own one. I had to buy one without a phone jack out of necessity (needed a phone right that second), but that’s what I’ve been hearing. You need a dongle to connect your wired earbuds, and while you’re using the dongle, you can’t charge your phone.
Has this changed?