Creative Labs HS-400 Headset . Device connectivity: Wired. Headphone frequency: 20 - 20000 Hz, Impedance: 32 Ом, Driver unit: 30 mm. Microphone frequency: 100 - 15000 Hz, Microphone sensitivity: -47 dB, Microphone input impedance: 10000 Ом. Weight: 90 g