Headset Headphones + Noise-canceling Mic + Quick Disconnect + Voice Tube for Nortel Meridian, Norstar, Avaya, Aspire, Nec, Polycom, Shoretel, Mitel, Altigen, Talkswitch, Plantronics T10 T20 Ip Phones Direct Connect Over The Head Headset, No Additional Applifiers / Adapters Required. Built-in noise-canceling microphone, voice tube, quick disconnect coil cord. Light weight durable headband, soft ear cushions for all day comfort. eadband Style with Single Earpiece for Great Sound Quality in One Ear. Adjustable microphone, extendable headband, shirt clip included.