JBL J55a BLK High Performance On Ear Headphones with JBL Drivers, Rotatable Ear Cups and Microphone, Black. Premium, high-performance JBL drivers Rotating, 180-degree DJ pivot mechanism Soft leather ear cushion with closed-back design Single-sided, detachable cable with rugged strain relief. Product Description: Drawing on expertise learned from building some of the finest loudspeakers in the world, JBL engineers created lightweight, on-ear headphones with a fresh look and uncompromising JBL sound. The J55as' premium drivers generate clarity and extended bass that competing products simply can't touch. Pure, accurate bass means you hear the truth from your music. Our unique DJ pivot mechanism lets you rotate either ear cup up to 180 degrees, so one ear can hear outside sound. An in-line microphone lets you take calls without taking the headphones off. And bold styling makes J55a headphones an aesthetic, as well as acoustic, triumph