DD ddHiFi DJ35A DJ44A 2.5mm Female to 3.5mm / 4.4mm Male Balanced adapter for Earphone Cable For Astell&Kern, FiiO, etc.
You may be interest in or need to buy below products.
DJ44A: 2.5mm BAL. female to 4. 4mm BAL. male adapter
Balanced adapter which you choose
10 xHi-Res Audio stickers