In the past, Sony mobile's products were compatible with Sony's audio products. For example, Xperia Z3 can be compatible with MDR-NW750N by system update. But, XZ1 cannot adapt to the new model IER-NW500N now. I hope that developers can add support for new models in the next system update.
Xperia Z3 is compatible with NW750NXZ1 is not compatible with IER-NW500N