Sennheiser HD-600, Headphones, Dynamic, Open, Circumaural, Impedance: 300 Ohm, Sound pressure level: 97 dB, Frequency range: 12 - 39,000 Hz, Cabling from both headphones, 3 m cable with 3.5 mm jack connection, Weight without cable: 253 g, Weight with cable: 309 g, Including 6.3 mm adapter