Voistek A2H20DHS Dual Ear Call Center Telephone Headset with Noise Canceling Microphone + Quick Disconnect + Volume Mute Controls for Nortel Nec Mitel Aastra Siemens GE 3Com Toshiba InterTel Sprint Talkswitch ShoreTel Iwatsu Packet8 ESI Allworx 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 Most Standard Telephones Equipped with Modular RJ Headset Port. 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, With Mute / Volume Control built in.