Never should have left. My wired IEMs never asked for a firmware update, asked me to install an app, weren’t flaky like Bluetooth, and never stopped working because battery ran out. If you get a thick. braided detachable cable, it’s a) easy to buy a new cable in the event of a short or other wear (versus throwing the whole unit out when the battery dies or expands) and b) doesn’t tangle (which seems to be a lot of folks’ biggest concern).