Sennheiser PC 3 Chat. Device interface: 2x 3.5 mm, Cable length: 2 m. Headphone frequency: 42 - 17000 Hz, Impedance: 32 Ом, Headphone sensitivity: 95 dB. Microphone frequency: 90 - 15000 Hz, Microphone sensitivity: -40 dB. Weight: 77 g