Apt-X codec is with Bluetooth music streaming is a MUST !!!! In collaboration with the available via Amazon Philips AEA2500 / 12 Bluetooth stereo adapter (cost about 40 euros) also the apt-X can, the sound is really perfect. I hear cross-border and am satisfied. No dropouts and no crackling audible. Even a very slight delay, almost not noticeable. After paring the two together the stick can be used on all devices as an external sound card.