For live sound recording engineers, dj's, hi-fi enthusiasts etc - driver unit: diam.= 40 mm + actuator: diam.= 50 mm - impedance: 32 ohms (@1khz) - sensitivity(spl): 102 db/mw (at max.power)- power handling: 500 mw(max.rated) - frequency response: 20 hz to 20,000 hz - weight: 315 g (including cord) - featuring : independent volume control (passive)+ 4 meter cable w/3.5mm gold plated stereo mini-plug + one 6.3mm gold plated stereo phone plug adapter. - rohs compliant.