Red4Power R4-H001. Device connectivity: Wired, Device interface: 3.5 mm, Cable length: 2 m. Ear coupling: circumaural, Headphone frequency: 20 - 20000 Hz, Impedance: 32 Ом. Microphone connectivity: 3.5 mm. Dimensions (WxDxH): 63 x 95 x 37 mm, Weight: 124 g. Certification: RoHS, CE