Wantek Corded Mono RJ9 Office Phone Headset Works for Cisco Phones Need to talk online long hours everyday? Such as Call Center Service, Conference Calls, Telemarketing, Banks, Office, Business... or other similar situations? Try the most affordable Wantek 4-Pin RJ9 Telephone Headsets, you will win Crystal Clear Call, hearing protection and All Day Wearing Comfort! This headset ONLY comes with RJ9 jack for some Cisco Phones, NOT come with 2.5mm jack, 3.5mm jack or USB jack. (DO NOT BUY IT FOR CELL PHONES OR COMPUTERS). Compatible Landline Phone List : Cisco IP Phones: 6821, 6841, 6851, 6921, 6941, 6945, 6961, 7811, 7821, 7841, 78617912, 7920, 7931G, 7940, 7940G, 7941, 7941G, 7942, 7942G , 79457945G, 7960, 7960G, 7961, 7961G, 7962, 7962G, 7965, 7965G, 79707970G, 7971, 7971G, 7975, 7975G, 8811, 8841, 8845, 8851, 88618941, 8945, 8961, 8865, 8941, 8945, 8961, 9951, 9971 Modle: KX-UTG200B, KX-UTG300B Modle: M10, M12, M22 & MX10 Amplifiers NOTICE: Not compatible with Cisco Spa phone series. Not compatible with Cisco 7902, 7905, 7905G, 7906, 7906G, 7910, 7910+SW, 7911, 7911G, 7912 IP Phones. If necessary, please purchase another compatible headset, ASIN: B093PTJK3K (Search the ASIN # on Amazon will get you to the product page) Friendly Notes: This headset ONLY works for some Cisco landline phones with 4-Pin RJ9 Jack, NOT for Smartphones and computers. If necessary, please purchase Wantek 2.5mm headsets, 3.5mm headsets or USB headsets. Do not buy the item if you can’t find your phone model in lists, pls consult us for compatibility advice. Crystal Clear Conversation With advanced noise-cancelling microphone and wideband sound, Wantek call center phone headset delivers a truly clear, natural and rich audio for calling even in noisy environments. Left & Right Ear 330°rotatable Mic can be worn on either the left or right side. Single-Sided office phone headset is ideal for users who prefer to leave one ear open to hear their environment. Convenient In-line Controls Professional Volume Control and Mute Switch built in. Easily adjust the headset volume up/down, mute/unmute the microphone. Easy to use, just plug the headset into the RJ9 Headset Port on your phone and you’re ready to talk. Free up Your Hands Full days online hands-free talking. Wantek RJ9 landline phone headset allows you to easily call while typing or taking notes. It's a practical and good companion for business, make your work more easier. Super Lightweight & Comfortable Weighs only 57g/2oz. Lightweight 4-Pin RJ9 telephone headset brings no burden to your head and ear, Super soft leatherette ear cushion and 90° Rotatable Earpiece enhance all-day wearing comfort. Fully Adjustable Headband Designed with flexible and adjustable headband, you can easily adjust and bend it to fit all head sizes to reduce the pressure from the headset. It helps you achieve the optimal wearing way.