The AKG EK500 is a 16' (5m) detachable coiled headphone cable with a mini 3-pin XLR female headphone connector on one end and an 1/8" stereo mini plug on the other end. This cable is for use with any AKG headphone equipped with a mini XLR 3-pin connector, such as K240 Studio, K240 MKII, K553 MKII, K702, K271 MKII, K182, K712 PRO, K275, K245, K175, etc.