Comdio H303G6 Mono Call Center Telephone Headset Headphone with Mic for Yealink SIP-T19P T20P T21P T22P T26P T28P T32G T41P T38G T42G T46G T48G and Huawei ET325 ET525 IP Phones ONLY WORKS FOR SOME SPECIFIC PHONES. SEE COMPATIBLE PHONE LIST IN DESCRIPTION, BUY THE ITEM TODAY IF YOU HAVE ONE OF THE PHONE MODELS LISTED BELOW. Direct connect over the head headset headphone, No additional amplifiers or adapters required, Most easy setup headset solution. Superior quality sound with the flexible adjustable noise cancellation microphone. Super Lightweight, Super Durable Headset with Comfortable ear and mic cushions, Shirt clip included. NO Mic Mute / Volume Control built in.