Compatible with Plantronics : M10, M12, M22;MX10 Amplifiers
Cisco IP Phones:
6821, 6841, 6851, 6921, 6941, 6945, 6961, 7811, 7821, 7841, 7861
7912, 7920, 7931G, 7940, 7940G, 7941, 7941G, 7942, 7942G , 7945
7945G, 7960, 7960G, 7961, 7961G, 7962, 7962G, 7965, 7965G, 7970
7970G, 7971, 7971G, 7975, 7975G, 8811, 8841, 8845, 8851, 8861
8941, 8945, 8961, 8865, 8941, 8945, 8961, 9951, 9971
Note:This is a RJ9 phone headset for Cisco phone, it does not work on cell phones, computers pc or laptop.