In June 2012 Plantronics discontinued the H91 and it is no longer available. The Plantronics HW251 SupraPlus Wideband Monaural Headset 64336-31 or the Plantronics HW291N EncorePro Monaural Professional Headset 78712-01 are the suggested replacements.
If you currently have a H91 and need Spares, Replacements or Accessories as The Headset Team has these available for you. Plantronics Encore Headset Accessories (H91/H91N/H101/H101N)
If you have any questions you can contact The Headset Team at 800-847-7068 to speak with one of our Plantronics Specialists. We are open 7 days a week.