DescriptionThese TRA Premium Communications Headphones have been specially selected with user comfort in mind.  The over ear closed cavity design is fitted with leather earpads and ultra soft memory foam to ensure listening comfort. This is essential for long periods of shortwave listening. Good dynamic range is achieved by the use of efficient 50mm NdFeB magnet drivers. The 3m connection cable means there is always sufficient length for headphone monitoring whilst engaged in other activities in your radio shack.  These headphones can be used with any communicatons product with  either a 3.5mm or 6.35mm stereo output socket. The durable, vacuum formed carry case, ensures your headphones are protected when not in use. TRA Communications Headphones Features:Impedance: 32 ohmsPower Rating: 400mWFrequency Response: 10Hz-32Khz /- 3dBCable length: 3 metersConnection Plug: 3.5mm phono (stereo) plus 6.35mm screw on adaptorWeight: 295gAccessories: 1 set spare earpads, 3.5mm-6.35mm phono plug adaptor, protective carry case.