Voistek Corded Call Center Telephone RJ Headset Noise Cancelling Headphone with Microphone and Quick Disconnect for Cisco 7970 9971 Office IP phones and Planronics M10 M12 M22 MX10 Amplifiers (Mono H10PCIS) Including Direct connect Headset cable ideal for Plantronics M10, M12, M22 & MX10 Amplifiers and Cisco IP phone models : 6921, 6941, 6945, 6961, 7821, 7841, 7861 Cisco IP 7931G, 7940, 7940G, 7941, 7941G, 7942G, 7945, 7945G Cisco IP 7960, 7960G, 7961, 7961G, 7965G Cisco IP 7970, 7970G, 7971G, 7975G Cisco IP 8941, 8945, 8961, 9951, 9971 Direct connect over the head telephone headset with Plantronics Compatible Quick Disconnect(QD), no additional amplifiers or adapters required, most easy setup headset solution. Superior Call Center quality headset for Cisco Unified IP Phones, excellent sound quality, lightweight, durable and comfortable for all day use Noise canceling microphone to reduce background noise and Acoustic Shock Protection circuit to protect your hearing. DO NOT BUY THIS ITEM IF YOU DON'T HAVE ONE OF THE PHONE MODEL LISTED ABOVE. Not compatible with Cisco Spa phone series, CONTACT US FOR COMPATIBILITY GUIDE IF NEEDED.