To work the headphones on the wire also need battery power!
This is clearly not indicated in the instructions:
"You can listen to music even if the headset is turned off. In this case, the noise cancellation feature will not be available. Turn on the headset to listen to high-resolution music or use the noise cancellation / surround mode feature."
and, of course, the question of poor quality when working from a wire remains open - did such speakers really deliver that the sound is pulled out only by a built-in amplifier with an enhancer? although perhaps this is a rhetorical question.