World's First THX® Certified HeadphonesThree Drivers - two balanced armatures and a separate dynamic driver deliver an extremely accurate listening experience with unsurpassed dynamic powerExpertly Tuned - by Grammy® Winning Sound Engineer, Luca Bignardi, to deliver a precise representation of your favorite musicComfortable Ergonomic Design - the oblique angled ear fittings naturally match your ear canals. 6 sets of included ear tip sizes ensure a proper fit for allIntelligent Control Technology - in-line controls are conveniently located allowing you to control volume, select songs, and take calls. A superior MEMS microphone eliminates cross-talk and background static.