Hidden beneath the Mix's ear cup cushions are a pair of 40mm "hyper-efficient Graphene drivers" and a couple of other surprises. Removing the cushion on one side reveals a removable panel for swapping out the Mix's battery, while the other side hides a storage spot for a USB-C wireless transmitter. The Mix headphones can connect to audio sources using a USB-C cable or wirelessly over Bluetooth 5.3 with support for the SBC and AAC codecs.