Sennheiser PC30 Skype Stereo Headset and Mic 3.5". Device connectivity: Wired, Cable length: 3 m. Headphone frequency: 40 - 18000 Hz, Impedance: 32 Ом. Microphone frequency: 80 - 15000 Hz, Microphone sensitivity: 38 dB, Microphone input impedance: 2 Ом. Certification: Skype certified