The HPX4000 provides everything you need for comfortable listening. The two rotating, reversible ear cups contain high-resolution cobalt capsules that deliver every nuance of your sound. And because of the demands of your active lifestyle, we’ve engineered the one-sided coiled cable from the finest oxygen-free copper wire that resists tangling and provides maximum durability. The HPX4000 also comes with a ¼ ” TRS adapter for the 1⁄8″ TRS connector, making it compatible with everything from your smartphone – to your mixing console.