The Plantronics EncorePro HW510 is a monaural noise-canceling wired headset designed for home telephones and teleconferencing. It features a comfortable headband design with an ear-pad for on-ear use, perfect for extended conversations. The headset includes a built-in microphone with a boom for clear communication and noise cancellation capabilities for a high-quality audio experience. With its sleek black color and reliable connectivity, this headset is a top choice for those seeking professional-grade audio performance in their home office or workspace.//please read. 4 units are HW510 / 1 unit is HW520 / preowned/