The P9 Signature deliver pristine sound that takes you to the very heart of your favorite music. Crystal clear treble, insightful midrange and a deep solid bottom end combine breathtaking performance. Connectivity Technology: Wired The P9 Signature headphones are exquisitely crafted from luxuriously high quality materials. Italian Saffiano leather and a forged foldable aluminum arms for greater durability and headband strength.3.5mm stereo jack (TRRS 4-pole CTIA spec.). Drive units-2x ø40mm (1.6in) full range New proprietary piston diaphragm speaker drivers deliver a unique coloration-free audio experience. The angled drivers also bring a superior spatial sound stage for a unique and immersive experience.