beyerdynamic DT-770 Pro 80 Ohm

Selling my brand new bayerdynamic studio headphone - used only once for testing. Specs: Closed-back Circumaural design Dynamic Diffuse-field equalised Impedance: 80 Ohm Sensitivity SPL (sound pressure level): 96 dB Frequency response: 5 - 35,000 Hz 3 m straight single-sided cable with 3.5 mm connector Screw-on adapter to 6.3 mm stereo jack Weight with cable: 346 g Weight without cable: 284 g RFS: Unwanted gift.