Mono, USB Type A, wired, over-the-head, monaural, supra-aural, noise-cancelling microphone, 20 Hz to 20 kHz With wired connectivity, the C3210 headset offers a great deal of flexibility. With these mono sound headphones, you can listen to your tape recordings or use them to hear phone calls on Skype. Listen to soaring vocals and deep subs with a frequency range of 20 Hz–20 kHz. Qualities Design of a boom/on-cable microphone The convenience of portability is provided by these supra-aural black wires. Technology for Connectivity: Wired USB