HiFi deluxe stereo headphones, dynamic type, "closed back" design - for live sound recording engineers, DJ's, Hi-Fi enthusiasts etc - driver unit: diameter = 40 mm + actuator: diameter = 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 with 3.5 mm gold plated stereo mini-plug + one 6.3 mm gold plated stereo phone plug adapter - ROHS compliant.