Compatible with Audio-Technica ATHPro700MK2, ATHPro5MK2, ATHPro500MK2, ATHM50XBT, ATH-M50xSTS-USB MIKU, ATHM50x ENSO, ATHM50X, ATHM50S, ATHM50, ATHM40X, ATHM40FS, ATHM35, ATHM30, ATHD40FS case. Compatible with many wired / wireless headphones.
eBay