Configured by Massdrop - Manufactured by AKG - Open-back construction - Pre-selected dynamic transducers - Flat-wire voice coil - Varimotion two-layer diaphragm - Genuine leather headband - Memory foam earpads with velour covering Individually tested and numbered - 2 year Warranty Serviced by AKG included - Detachable 9.8 ft (3 m) straight cable with 1/8 in (3.5 mm) jack - Frequency response: 10 to 39,800 Hz - Sensitivity: 105 dB/V; - Maximum input power: 200 mW - Rated impedance: 62 Ohms 8.3 oz (235 g)