Steelseries Siberia v2. Device connectivity: Wired, Device interface: 2x 3.5 mm, Connector contacts plating: Gold. Ear coupling: circumaural, Acoustic system: closed, Headphone frequency: 18 - 28000 Hz. Microphone frequency: 50 - 16000 Hz, Microphone sensitivity: -38 dB, Microphone connectivity: 3.5 mm. Volume control: Digital