Plantronics Blackwire C620-M Wired Stereo Headset - Over-the-head - Semi-open - 6.80 kHz - USB. For those who spend hours each day on long conference calls, webinars and video conferencing, the exceptional voice clarity and all-day comfort of the Blackwire 600 Series make communications more effective and productive. Featuring a flexible boom, a noise-canceling microphone and digital wideband telephony, the Blackwire 600 Series delivers the performance and comfort necessary in busy calling environments. The over-the-head design can be worn in a monaural (single earpiece) or binaural (dual earpiece) style and features generously padded ear cushions for optimal comfort during phone-intensive tasks.