2.What material is the included cable of the EM5? Is it replaceable? And how to change the earphone plug?

The EM5 is equipped with a 4-strand 120-core high-purity pure silver cable. Compared with monocrystalline silver-plated copper cable, the pure silver one has better conductivity, lower impedance, relatively warm mid-frequencies, and richer high-frequency details.
The cable is integrated with the earphone units so that it cannot be replaced. But it comes with a balanced 2.5mm and 4.4mm, and a single-ended 3.5mm plug which is optional based on one's needs.
The EM5 is designed with a swivel-lock replaceable plug. Turn the male to ON/OFF to unlock/lock it. For more details, please read the instruction manual.