Plantronics SupraPlus HW251N Black Headband Headsets. Features: Noise-Canceling microphone filters out background sound. 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 technology. Lightweight. Leaves One Ear Uncovered For Person-to-Person Conversations. Use with plantronics vista M22, M12, or MX10 (we sell them separately) & VOiP Voice Over IP
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