NOT FOR COMPUTER: This headset is with RJ9 jack, please DO NOT BUY IT FOR COMPUTER OR LAPTOP. Designed for Call Centers and Offices: MKJ Cisco phone headsets are designed to provide the ultimate in comfort and performance for busy call center professionals. With corded RJ9 telephone headsets, they can fully focus on the calls. Headsets free their hands from cradling the handset with shoulder and neck. The quick Disconnect feature provides walkaway convenience, enabling users quickly leave for a short time. Great Durability: Quality materials are used to ensure the ultra-durability of telephone headsets for Cisco phones, the reinforced cord is built to withstand the demanding environment and is protected against office chair wheels, and sharp objects on daily use, and the durable construction allows Cisco headset for long time use. Luxurious Comfort: Being lightweight and simple, MKJ Cisco phone headset is comfortable enough to wear for an extended period of time, with no pressure on your head even for a long time wearing. An adjustable headband fits different head sizes and the gooseneck microphone boom offers an accurate talking position. What's more, a single earpiece headset can be worn on either side and you can still communicate with your colleague while wearing it. Work with Cisco Phones ONLY: This telephone headset with RJ9 jack is compatible with Cisco phones, such as Cisco 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 and 8900, 8941, 8945, 8961, 9951, 9971 (included but not limited). Please do not buy it for CISCO SPA series phones which require a 2.5mm headset cable. Noise Canceling Headset for Cisco Phone: MKJ phone headset with mic for Cisco phones enable you to talk hands-free. It features a noise-canceling microphone which reduce most of the ambient noise, making your voice crystal clear. Wired headphones with microphone are ideal for those who take a high volume of calls every day and require premium sound clarity, such as call center agents, telemarketing offices, home phone job users, customer service, etc.