Pre Owned Condition With Very Little Sign Of Wear. The Plantronics Blackwire Mono C3210 USB-A Over The Ear Headsets are high-quality headsets designed for computer and desktop use. With a sleek black design and a comfortable headband form factor, these wired headphones feature a single earpiece for added convenience. The built-in microphone mute button, volume control, and noise cancellation capabilities make it easy to communicate and work in a quiet environment. Made by Plantronics, a trusted brand in audio technology, these headsets are a reliable choice for professionals and individuals seeking a superior audio experience.