Sennheiser HD 6 Mix DJ Headphones Elliptical, closed back circumaural design delivers maximum comfort and reduces background noise to a minimum in even the loudest of listening environments 150 ohm impedance for optimum compatibility with studio and mixing equipment Crafted from durable, high quality parts to guarantee years of use Single-sided coiled cable can be attached to either ear cup; straight cable included (both up to 3m) Premium protective case included. Two year warranty