Voistek Corded Mono Monaural Call Center Telephone RJ Headset Noise Cancelling Headphone with Mic Comfort Fit for Avaya 1608 9611 Panasonic KX-T Yealink T20 Cisco 7902 Snom 300 IP Phones (H10DKXT) DO NOT BUY THIS HEADSET IF YOU DON'T HAVE ONE OF THE PHONE MODEL LISTED BELOW IN DESCRIPTION. CONTACT US FOR COMPATIBILITY GUIDE IF NEEDED. Direct connect over the head RJ headset, no additional amplifiers or adapters required, most easy setup headset solution. Superior Call Center quality headset for desk phones, 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. This KXT Landline telephone Headset is NOT compatible with Cisco 7940, 7960 & 7970 ...ect IP Phones.