Ozone Rage ST. Device connectivity: Wired, Device interface: 2x 3.5 mm, Cable length: 2.5 m. Ear coupling: circumaural, Acoustic system: open, Headphone frequency: 20 - 20000 Hz. Microphone sensitivity: 38 dB, Microphone input impedance: 2.2 Ом. Weight: 0.3 kg