Audicom Mono Call Center Headset with Mic + Quick Disconnect Headphone for Yealink SIP-T19P T20P T21P T22P T26P T28P T32G T41P T38G T42G T46G and Huawei ET325 ET525 Telephone IP Phones (700RQDGXPC) Direct connect over-the-head headset, No additional amplifiers or adapters required, Most easy setup headset solution. Noise canceling microphone to reduce background noise and Acoustic Shock Protection circuit to protect your hearing. Superior Call Center quality headset, excellent sound quality, lightweight, durable and comfortable for all day use. ONLY PURCHASE IF YOU HAVE ONE OF THE PHONE MODELS LISTED BELOW, CHECK OUR STORE FOR HEADSETS FOR OTHER PHONE MODELS OR CONTACT US FOR COMPATIBILITY GUIDE! NO Mic Mute / Volume Control built in.