Plantronics HW251N SupraPlus Wideband Headset wired

Noise-Canceling microphone filters out background sound HW251N Uses Plantronics QD Quick Disconnect Connector. Must be used with Plantronics Amp or with proper phone or USB adapter cable Connectivity Technology: Wired, Earpiece Design: Over-the-head, Earpiece Type: Monaural, Host Interface: Proprietary, Microphone Design: Boom, Microphone Technology: Noise Canceling, Product Model: HW251N, Product Series: SupraPlus, Easy Lightweight Wear -Leaving One Ear Uncovered For Person-to-Person Conversations KAR BX 33