Red4Power R4-H002. Device connectivity: Wired, Device interface: 3.5 mm, Cable length: 2.2 m. Ear coupling: circumaural, Headphone frequency: 20 - 20000 Hz, Impedance: 32 Ом. Microphone connectivity: 3.5 mm. Dimensions (WxDxH): 150 x 85 x 220 mm, Weight: 380 g. Volume control: Rotary