Compatible with Yealink IP phones models: Yealink IP T23G, T27G, T29G, T32G, T33G, T38G, T40G, T42G, T46G, T48G, T49G, T41S, T42S, T46S, T48S, T52S, T53W, T54W, T57W, T55A, T56A, T58A, T42U, T43U, T46U, T48U,T20P, T21P, T22P, T26P, T27P, T28P, T40P, T41P, Grandsteam GXP 1615 1620 1625 1630 2130 2135 2140 2160 2170 3240 3370 | 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. | Most Comfortable: 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. Compete with Plantronics or Jabra heavy duty Phone Headsets for Call Center, Telemarketing & Office. | Ultra Durable: Precision design, quality plastics, unibody headband construction, metal mic boom joints makes this call center headset sturdier and more durable. You can even pull or bend the headband for personal optimal fit. | Convenient In-line Controls: Convenient inline volume and mute controls allows a more flexible listening experience. 5.4ft long cord offers flexibility to move around,designed to keep pace with the demands of work and life.