B-Stock, OLLO Audio S5X Calibrated studio headphones, Version 1.1, over ear, open back, dynamic, frequency range: 15 Hz - 22 kHz, impedance: 50 ohms, sound pressure level: 108 dBSPL, ear pads made of leather and velour, removeable cable, two sided cable, connection: 3,5mm stereo mini jack,adapter 3,5mm to 6,3mm stereo jack included, ear cups made of american walnut, headband made of stainless steel and artificial leather, paired speakers (hand selected), immersive mixing headphones especially made for mixing and mastering of binaural music and Dolby Atmos, delivery content: S5X headphones, carrying puch, 2m cable with adapter 3,5mm to 6,3mm, certificate of authenticity, protocol of frequency measurement, weight: 420g, B-Stock with full warranty, may have slight traces of use