Cleveland Call Center Headset for Cisco Phones, Noise Cancelling Mic + Quick Disconnect for 7940, 7941, 7942, 7945, 7960, 7961, 7962, 7965, 7970, 7971, 7975 Lightweight, easy to install. Can be worn on all day on left or right ear. Free quick disconnect cable included. No Additional Cables / Amplifiers / Adapters Required Noise canceling microphone to reduce background noise and Acoustic Shock Protection circuit to protect your hearing. USA based customer service. Only compatible with the following Cisco VoIP phones: 12VIP, 30VIP, CTS 500, 7931G, 7940G, 7941G, 7942G, 7945G, 7960G, 7961G, 7962G, 7965G, 7970G, 7971G, 7975G, 6921, 6941, 6945, 6961, 7821, 7841, 7861, 8811, 8841, 8851, 8861, 8941, 8945, 8961, 9951, 9971, Please only buy this item if you have found your phone model above. The model number is typically located on the back of the phone or above the LCD screen.