HE1000se Planar Magnetic Open-Back Headphones feature nanometer-thin diaphragms, invisibility magnets, asymmetrical earpads, 8Hz-65kHz freq., 35 Ohms impedance, a wide headband, ear cups molded to ear shape, CNC milled/hand-polished enclosure, 3.5mm/4.4mm cables. adapter.   Features Nanometer-thick diaphragm Acoustically invisible stealth magnets Reduced distortion and harmonious sound Frequency Response: 8 Hz to 65 kHz Window Shade system protects the driver and is optimized for the open-back design Asymmetrical earcups follow the natural shape of the human ear Sturdy connector design CNC-milled and hand polished Includes 3.5mm cable, 4.4mm balanced cable, and a 3.5mm to 1/4" adapter