Open-back studio headphones: Hi-Res audio certified, Monitor 80 is a reliable companion for mastering, mixing, or tracking. 250 ohm nominal impedance: The sound it delivers is more stable, solid, and powerful. They must be driven by AMP, when use them with phone, computer or other audio devices. Professional studio headphones: Advanced high-precision etched diaphragms protected by aluminum honeycomb housing. Crafted open-back design reduces distortion and outputs accurate and full-range pure sonic. Exceptional wearing comfort: A customizable fit for long-time use in the studio. Soft-to-the-touch velour ear pads and adjustable headband put no pressure on your skull and leave enough space for ventilation. Adapter-free: Detachable cables open up more possibilities for the creation of music, including a standard 3.5mm audio cable and a 1/4 inch stereo adapter cable.