AD700X Open-back high-fidelity headphones offering a natural and precise listening experience, with a 3D wing support structure for a comfortable and immersive home-listening fit Balanced bass, mid and treble, with 53 mm drivers, allows natural sound reproduction. 53 mm drivers with bobbin-wound ccaw voice coils reproduce clear treble and midrange. Open-back design for reduced ear pressure and natural listening sensation. 3m cord length. 3.0m single sided cord. 3.5mm jack with 6.3mm adaptor. 53mm driver. (not included). Manufacturers 2 year guarantee.