Voistek Corded Binaural Call Center Telephone Headset RJ9 Headphone with Mic Noise Cancelling for Aastra Polycom Mitel Office Landline Phones and Call Center (K20) See Compatible Phone List (PARTIAL) in Description, DO NOT BUY IF YOU CAN NOT FIND YOUR PHONE MODEL IN LIST, CONTACT US FOR COMPATIBILITY GUIDE ON YOUR SPECIFIC TELEPHONE MODEL IF NEEDED. Direct connect over the head telephone headset, no additional amplifiers or adapters required, most easy setup headset solution for Most Standard Telephones Equipped with Modular RJ Headset Port. Check Compatible phones listed in Description. Superior call Center quality headset for desk phone, 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. A LANDLINE TELEPHONE HEADSET WITH Flexible goose neck boom,adjustable headband,Extra comfortable leatherette ear pad, Shirt clips included, NO Mute / Volume Control built in.