NGS Vox340dj. Device connectivity: Wired, Device interface: 3.5mm. Ear coupling: circumaural, Headphone frequency: 100 - 18000 Hz, Impedance: 32 Ом. Microphone input impedance: 2200 Ом. Package dimensions (WxDxH): 246 x 90 x 282 mm, Package weight: 0.34 kg