Massdrop X AKG K7XX Audiophile Open-Back Reference Headphones Description: Condition: New Opened BoxFeatures:Configured by MassdropManufactured by AKGOpen-back constructionPreselected dynamic transducersFlat-wire voice coilVarimotion 2-layer diaphragmGenuine leather headbandMemory-foam ear pads with velour coveringIndividually tested and numberedDetachable 9.8 ft (3 m) straight cable with ⅛ in (3.5 mm) jackFrequency response: 10–39,800 HzSensitivity: 105 dB/VMaximum input power: 200 mWRated impedance: 62 ohmWeight: 8.3 oz (235 g)IncludedAKG K7X