Plantronics Poly Blackwire C3220 USB Headset

Stereo – Black – USB type A – wired – 20 Hz – 20 khz – over-the-head – binaural – supra-aural – noise Cancelling microphone Hi-Fi stereo with passive noise reduction Connectivity technology: wired Minimum frequency response: 20 Hz Maximum frequency response: 20 khz Earpiece type: binaural