Voistek A2H20DKXT Dual Ear Call Center Telephone Headset with Noise Canceling Microphone for Grandstream GXP14XX GXP2140 GXV3275 Yealink SIP-T19P T48G Snom 320 870 Panasonic KX-T Series Avaya Cisco Altigen Cortelco & Huawei Office IP Phones See Compatible Phone List in Description, DO NOT BUY IF YOU CAN NOT FIND YOUR PHONE MODEL IN LIST, Just get FREE HEADSET EXPERT HELP or ADVICE by CONTACTING US. Direct connect over the head headset,no additional amplifiers or adapters required, most easy setup headset solution for some specific phones listed in description. Superior call Center quality headset, excellent sound quality, lightweight, durable and comfortable for all day use Noise canceling microphone to reduce background noise and Acoustic Shock Protection circuit to protect your hearing. Flexible goose neck boom,adjustable headband,Extra comfortable leatherette ear pad, Shirt clips included, NO Mute / Volume Control built in.