Gold-plated 3.5mm stereo plug with 1/4″ adapter; Optimized performance for use with most professional & consumer audio devices; Closed-back, over-ear design reduces background noise; Single-sided cord with oxygen-free copper wires; Driver size: 50mm; Max input power: 100mW; Freq resp: 20Hz-22kHz; Imp: 32ohm +/-15%; Sensitivity: 115dB +/-3dB/mW (@ 1kHz); 7ft cable;