Apple’s wireless future has been delayed.

The iPhone-maker revealed today that it is still not ready to start shipping Apple AirPods, even though customers were told they would launch by the end of October.

“The early response to AirPods has been incredible. We don’t believe in shipping a product before it’s ready, and we need a little more time before AirPods are ready for our customers,” an Apple spokesperson told TechCrunch.

Apple didn’t specify if its a hardware or software issue that is holding back the AirPods. The new buds are supposed to be a complimentary accessory for the iPhone 7 and iPhone 7 Plus. Both new phones don’t have a headphone jack, requiring owners to use a dongle to charge and listen to wired headphones at the same time.

The new wireless earbuds were announced at the iPhone 7 event last month. To boost audio quality, Apple created its own W1 Bluetooth chip that is extremely energy efficient. AirPods are supposed to link seamlessly with iPhone and come with a built-in microphone so wearers can give Siri commands.

Early reviews for AirPods were fairly positive in terms of performance and battery life. Apple did not give a date for when fans can finally expect to buy a pair.