Smith Corona Classic Binaural Headset with Cisco Cord & PLT QD Binaural Noise Canceling headset with Plantronics QD compatibility Has a Plantronics compatible quick disconnect, same QD as their headsets Headset comes with bottom cord to connect to Cisco 7900 & 8900 series phones Includes 3 yr repair warranty by manufacture Smith Corona, contact manufacture for details Headset will plug into Cisco 7900 & 8900 series phones headset port