Background Noise Supressor

Background noise supressor fits Plantronics Supra, Encore, TriStar, Mirage, DuoSet, DuoPro and StarSet headsets with voice tube microphones only. Helps to block out noise in your office so the person on the other end of the call doesn't hear it. (This item is not compatible with Plantronics noise-canceling headset models--this means any model ending with the letter "N" such as the Supra H51N, for example.)