Voistek A2H20PHIC Dual EarCallCall Center Telephone Headset with Noise Canceling Microphone + Quick Disconnect + Volume Mute Controls for Aastra Adtran BT Alcatel Lucent Avaya Ascom Audioline Elmeg Gigaset Interquartz Lazerbuilt Safecom Ericsson Hybrex Ulytel 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.