Audicom Mono Call Center Headset with Mic + Quick Disconnect Headphone for Plantronics M22 Amplifier and Cisco Unified Telephone IP Phones 7931G 7940G 7941G 7942G 7945G 7960G 7961G 7962G (700RQDRJ2A) 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 ONLY PURCHASE IF YOU HAVE ONE OF THE PHONE OR AMPLIFIER MODELS LISTED ABOVE. NOT COMPATIBLE WITH CISCO SPA SERIES. Direct connect over-the-head headset, No additional amplifiers or adapters required, Most easy setup headset solution. Noise canceling microphone to reduce background noise and Acoustic Shock Protection circuit to protect your hearing. Superior Call Center quality headset, excellent sound quality, lightweight, durable and comfortable for all day use. NO Mic Mute / Volume Control built in.