While the exact reason for the delay remains unclear, a person familiar with the development of AirPods told The Wall Street Journal that Apple’s troubles appear to be related to its “efforts to chart a new path for wireless headphones,” in addition to resolving what happens when users lose one of the earpieces or the battery dies.

I’ve been using the AirPods since they were introduced at the event and I love them. I’ve had a couple of very minor issues over the last couple of months, but nothing significant. These things are going to sell really well.