Shure SRH1540 Premium Studio Closed Back Headphones - Closed Back, Circumaural Design - Transducer Type: Dynamic, Neodymium Magnet - Driver Size: 40mm - Frequency Range: 5Hz to 25kHz - Sensitivity: 99dB/mW @1kHz - Impedance: 46 Ohms @1kHz - Max Input Power: 1000mW - Connectors: MMCX Connectors, Gold-plated 3.5mm Stereo Mini Jack with 6.35mm Threaded Adapter - Cable: 1.83m Dual-Exit Detachable Oxygen-free Copper Cable - Removable Alcantara Ear Pads - 2 Years Limited Warranty