B-Stock, Sendy Audio Apollo Over Ear headphones- Quad-Former technology, magnetostatic, driver size 68 mm, open back, frequency range 20 - 40000 Hz, sound pressure: 95 dB, ± 3 dB, impedance: 16 ohms, cable: 2m with 4,4 mm Pentaconn jack, delivery contents: headphones, balanced audio cable, leather case, bag made of hemp, 4,4,mm to 3,5mm adapter, weight: 395g, B-Stock with full warranty, may have slight traces of use