ONLY WORKS with Plantronics M10, M12, M22 & MX10 Amplifiers or CISCO IP phone models : Cisco IP 6921, 6941, 6945, 6961, 7821, 7841, 7861 Cisco IP 7940, 7940G, 7941, 7941G, 7942, 7942G, 7945, 7945G Cisco IP 7960, 7960G, 7961, 7961G, 7962, 7962G, 7965, 7965G Cisco IP 7970, 7970G, 7971, 7971G, 7975, 7975G Cisco IP 8811, 8841, 8851, 8861, 8941, 8945, 8961, 9951, 9971 or AVAYA CALLMASTER V VI ONLY COMPATIBLE FOR SOME SPECIFIC PHONE MODELS LISTED ABOVE. Not compatible with Cisco Spa phone series. FOR OTHER PHONE MODELS, PLS CONTACT US FOR COMPATIBILITY GUIDE OR ADVICE.

Please Check the Compatible Phones list before your order.DO NOT BUY THE ITEM IF YOU CAN NOT FIND YOUR PHONE MODEL IN LISTS, CONTACT US FOR ADVICE. High Sound Quality for Clear Communication: Wideband Sound telephone headset enables natural listening experience, features Noise Canceling Microphone to reduce background noise, Acoustic Shock Protection Circuit to protect your hearing. Most Comfortable Headset: Super lightweight office telephone RJ headset with adjustable headband to fit all head sizes, high quality and soft leatherette ear cushion enhance all-day wearing comfort. ONLY For CISCO 6921, 6941, 6945, 6961, 7940, 7940G, 7941, 7941G,7942G, 7945, 7945G, 7960, 7960G, 7961, 7961G, 7965G, 7970G, 7971G, 7975G, 7985G 8941, 8945, 8961, 9951, 9971 IP Phones.