DESC: Plantronics Encore H91N Headset with Noise Cancelling Microphone (PLH91N) The Supra H91N Headset is the top-of-the-line headset from Plantronics, the world leader in hands-free telephone technology. The Supra series is Plantronics' most innovative new headset design yet, featuring brand new sound and tone adjustment technology, specially designed to produce the finest quality sound imaginable. On top of that, the H91N comes with a noise cancelling microphone, designed to filter out background sounds and conversations, resulting in a clear, easy-to-understand transmission - even in a crowded office!