Closed back headphones feature a 40mm driver unit for tight clean and loud music reproduction. With a 20Hz-22KHz frequency response, you'll be sure to get the most from your sound source. Features: Comfortable on-ear cushions, Detachable headphone cable: 1m straight cable with mic + volume control, Carrying Bag, 1/4" Phone Plug, Adjustable headband. Specifications: Impedance: 32 ohm +/- 15%, Sensitivity: 104 +/- 3dB, Weight: 195g +/- 10g.