Wantek Binaural Call Center Telephone Headset Headphone with Mic and Volume Mute Control for Cisco Unified IP Phones 7931G 7940G 7941G 7942G and Plantronics M10 MX10 Vista Modular Adapters(H120B02B) ONLY Compatible with Plantronics Amplifier: M10 M12 M22 & MX10 Vista Modular Adapters and 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 Direct connect over the head telephone headset headphone, No additional amplifiers or adapters required, Most easy setup headset solution. Superior Call Center quality sound headset with flexible adjustable noise canceling microphone. Super Lightweight, Super Durable Headset with Comfortable ear and mic cushions for all day use. ONLY BUY THE ITEM TODAY IF YOU HAVE ONE OF THE PHONE OR AMPLIFIER MODELS LISTED ABOVE. Not compatible with Cisco Spa phone series.