I used to drape the long coiled cord over my neck twice and wear it like necklace. I already looked like a dork so it didn't matter. They make a short cable too now which makes it more portable, not sure if it's compatible with your model.
1.2 m (3.9’) straight cable. Compatible with ATH-M40x, ATH-M50x, ATH-M60x, and ATH-M70x headphones.Please note, this cable is not compatible with the ATH-M50xBT headphones.
www.audio-technica.com
Here's another cool gadget I have which boosts the sound quality even further by amplifying the signal. It connects to your phone and tablet via bluetooth so you can get high quality audio even with devices that lack a headphone jack.
With mobile devices removing 3.5mm headphone jacks, the Bluetooth amplifier fits a current need. After introduced the BTR1 and μBTR to the market, FiiO now brings forward the even mightier BTR3.FiiO--Born for Music
www.fiio.com