4Call K502CMB Binaural Call Center Telephone RJ11 Headset Headphone with mic + Noise Cancelling for Plantronics M10 M22 Vista Adapter and Cisco 7975 9971 Office Landline Desk IP Phones WORKS ONLY FOR PHONES LISTED IN DESCRIPTION, BUY ONLY WHEN YOU HAVE ONE OF THE PHONES LISTED. CONTACT US FOR GUIDE IF YOU ARE NOT SURE ABOUT YOUR PHONE COMPATIBILITYWorks for Cisco 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 headset, no additional amplifiers or adapters required. Adjustable fit headband and comfortable ear cushions enhance for wearing comfort, even for long periods. With two earpieces and a noise canceling microphone, this headset is ideal for noisy offices. It delivers high quality sound to both ears, enabling you to concentrate fully on the caller with minimal distraction & superior sound pick up Flexible microphone boom, 270 degree rotatable, which adjusts to suit your preference, you can also choose to wear the microphone on either your right or left side. Long coiled cord stays out of your way by stretching for long reach, and coiling up for regular use. Shirt clip keeps the weight of the cord off your head while you talk, and lets the headset hang freely when you take it off