Massdrop x AKG K7XX Audiophile Reference Open Back Headphones ————- Contents: Headphones, Cable. Used Tested Working Condition. ————- Configured by Massdrop Manufactured by AKG Open-back construction Preselected dynamic transducers Flat-wire voice coil Varimotion 2-layer diaphragm Genuine leather headband Memory-foam ear pads with velour covering Individually tested and numbered Detachable 9.8 ft (3 m) straight cable with ⅛ in (3.5 mm) jack Frequency response: 10–39,800 Hz Sensitivity: 105 dB/V Maximum input power: 200 mW Rated impedance: 62