ONLY Compatible with Plantronics M10, M12, M22 & MX10 Amplifiers and 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 | ONLY WORKS FOR SOME SPECIFIC PHONE MODELS LISTED ABOVE. Not compatible with Cisco Spa phone series. For other phones, pls contact us for Compatibility Guide or Advice. | HD Voice for Clear Communication: Wideband Sound telephone headset enables natural listening experience, noise canceling microphone provides greater focus and concentration by blocking background noise, plus acoustic Shock Protection to protect your hearing. Less noise, Clearer voice. | Ultra durable office headset with reliable structure, build for last. Six levels of adjustable and a lightweight design ensure all day comfortable wearing. You can even pull or bend the headband for personal optimal fit. | Super lightweight Phone Headset with adjustable headband to fit all head sizes, high quality and soft leatherette ear cushion enhance your wearing comfort while long time conversation. professional Volume Control and Mute Button built-in.Compete with Plantronics or Jabra heavy duty Headsets. 45 days money-back guarantee and 24 months warranty by ARAMA.