The HD668B is a semi-open dynamic headphone whose sound quality meets the demand of even professional recording studios. The balanced and high definition sound of the HD-668D assures that a professional sound engineer can have full confidence when mixing down or during post production. Its patented sturdy headband structure provides long-lasting durability even in challenging conditions, yet its light weight and optimized mechanical pressure provides long-term wearing comfort. The HD668B comes equipped with 2 detachable.