Product details of HP DHE-8011 Stereo Headphone with Mic
Frequency Response: 20Hz-20KHz.
Speaker Size: 50mm.
Speaker Sensitivity: 105dB ± 3dB.
Speaker Impedance: 32 Ω ± 15%
Rated Power: 30mW.
Microphone Type: Omnidirectional.
Microphone Size: 4x1.5 mm.
Microphone Sensitivity: -42dB ±