COMPATIBLE with most Polycom Mitel Plantronics etc telephone models that listed in , Or contact us for more compatibility guidance. 45 days money-back guarantee and 24 months warranty by ARAMA. Easy to use: Convenient inline volume and mute controls allows a more flexible listening experience.Simply plug in and play, no installation needed.5.3ft long cord offers flexibility to move around,designed to keep pace with the demands of work and life. Built to Last: Precision design, unibody headband construction.The cable is right length to give you the freedom to stand up and stretch during long conversations. Compete with Plantronics or Jabra heavy duty Phone Headsets for Call Center, Telemarketing & Office. Tested Ergonomic Design: The rigorously tested ergonomic design providing all-day comfort. Ultra-soft, large protein earpads and adjustable headband distributes weight evenly, so it feels as comfortable on your last call of the day as it did on the first. Calls made clear: The rj phone headset engineered for greater productivity and natural sound delivery. Incorporates optimized wideband audio technology and noise cancelling mic to enable you enjoy a clear internet call freely.