【NOT for Cell Phones and Computers】COMPATIBLE with some specific landline Phone Models in description like Yealink Grandstream Avaya Cisco Panasonic Snom Zultys, etc. This RJ9 phone headset for Yealink VoIP phones 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, etc. | Grandstream IP Phones Compatibility: Works for Grandstream GXP1400, GXP1405, GXP1450, GXP1610, GXP1615, GXP1620, GXP1625, GXP1628, GXP1630, GXP1200, GXP2000, GXP2100, GXP2010, GXP2110, GXP2020, GXP2120, GXP2124, GXP2130, GXP2135, GXP2140, GXP2160, GXP2170, GXP280, GXP285, GXV3005, GXV3006, GXV3240, GXV3275, GRP2612, GRP2612P, GRP2612W, GRP2613, GRP2614, GRP2615, GRP2616 IP Phones. For other phones and models, please feel free to consult us for compatibility guide and advice. | Crystal Clear Chat: This corded telephone headset with flexible, adjustable noise-cancelling microphone to reduce background noise in noisy environment and Acoustic Shock Protection Circuit to protect your hearing. Fewer noises, clearer voices. | Super Comfortable: Super lightweight phone headphone with adjustable headband to fit all head sizes. Soft leatherette ear cushion make you feel less pressure on your ear to enhance all-day wearing comfort. | Durability & Warranty: Precision design, quality plastics, unibody headband construction and superior quality microphone make this call center headset sturdier and more durable. The telephone headsets come with 45 days return for replacement and 2 year warranty.