Shure SRH1440, open reference recording and mastering Headphone, dynamic, Neodym, 37 ohms rated impedance, 1000mW maximum input, frequency range: 15 - 27.000 Hz, 101dB/V sensitivity, 2,1m removeable jack cable with 3.5mm stereo mini-plug. 1/4" screw-on adapter, weight: 343g (without cable),incl. earpads,case,cable