Fivetech LCAP Headset for Cisco 6921 6941 6945 6961 7931 7940 7941 7942 7945 7960 &hellip; (FB-RJ9) The Headset not work with Avaya All telephone.ONLY COMPATIBLE WITH Cisco Unified IP Phones: 7931G 7940 7940G 7941 7941G 7942 7942G 7945 7945G 7960 7960G 7961 7961G 7962 7962G 7965 7965G 7970 7970G 7971 7971G 7975 7975G 6921 6941 6945 6961 7821 7841 7861 8811 8841 8851 8861 8941 8945 8961 9951 9971 and Plantronics Amplifier: M10 M12 M22 & MX10 Vista Modular Adapters MOST COMFORT HEADSET: Ultra lightweight office RJ headset with adjustable headband to fit all head sizes, a flexible mic boom to suit your preference, Soft silicon T-pad and high quality ear cushion enhance all-day wearing comfort. ULTRA DURABLE: Precision design, quality plastics, unibody headband construction, flexible metal mic boom make this call center headset sturdier and more durable. Compete with Plantronics or Jabra heavy duty Headsets for Call Center, Telemarketing & Office. Fits for Plantronics M10, M12, M22 & MX10 Amplifiers or CISCO IP phone models : CTS 500 Cisco IP 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 or AVAYA CALLMASTER V VI Office telephone Headset earphone single earpiece handsfree deskphone head sets for telemarketing cWORKS ONLY FOR THE SPECIFIC PHONE MODELS LISTED ABOVE. FOR OTHER PHONE MODELS, PLS SEARCH: ARAMA TELEPHONE HEADSET FOR MORE OPTIONS OR CONTACT US FOR COMPATIBILITY GUIDE.