Enhanced Productivity: Stay focused on your tasks with headsets. Telephone headsets with RJ9 bottom cord connect with your Cisco 78xx, 79xx, 88xx 99xx IP phones directly. With Cisco compatible headset, you will be able to do multiple tasks during the calls, and the headset saves your neck from neck pain. And the quick disconnect allow you to leave desk without taking headset off. The coil curl cable's 2-meter stretch gives you the freedom to move around your desk. Durable RJ9 Phone Headset: Built to last, MKJ headset for Cisco phones boast a sturdy construction to withstand the heavy use, ensuring longevity and reliability. Unibody constructure, quality plastic parts, PU materials, stainless steel headband and reinforced cord ensure the headsets with great durability. Also, our Cisco headset for call center office has undergone drop tests, stress tests and plug-and-play tests. Comfortable Headset for Office Phone: MKJ telephone headset for office phone provides all-day wearing comfort for busy professionals. Lightweight ergonomic design, soft ear cushions, adjustable headband ensure users with a great wearing experience. The adjustable headband fits for any head sizes, 330° rotatable microphone boom can be easily adjusted for any talking position and headsets can be worn on left or right ear. Superb Sound Clarity: Phone headset with microphone for Cisco phone is a great options for users who want exceptional sound quality and wearing comfort. MKJ telephone headset with superior noise cancelling mic reduces sharp breathing sounds and popping noises often heard during the call. The microphone picks up your voice loud and clear, your voice will be heard clearly. Headset Compatibility: This corded RJ9 telephone headset only works on Cisco IP phones with RJ9 headset jack, such as Cisco 6821, 6841, 6851, 6921, 6941, 6945, 6961, 7821, 7841, 7861, 7931G, 7940, 7940G, 7941, 7941G, 7942G, 7945, 7945G, 7960, 7960G, 7961, 7961G, 7962G, 7965G, 7970, 7970G, 7971G, 7975G, 7985G, 8811, 8841, 8845, 8851, 8861, 8865, 8941, 8945, 8961, 9951, 9971. Please do not buy this headset for Cisco SPA series phones.