JVC HARX500 Full-Size Headphones (Silver)<br /><br /><br />&nbsp; &nbsp; Ear-direct structure<br />&nbsp; &nbsp; v<br />&nbsp; &nbsp; Sensitivity: 100 dB/mW<br />&nbsp; &nbsp; Maximum Input Capacity : 1200mW (IEC)<br />&nbsp; &nbsp; Nominal Impendence : 3