Comdio H403VP5 2.5mm Call Center Headset Headphone with Mic + Volume Mute Controls for Cisco Linksys SPA Clarity XLC3.4 D704HS D704C D703HS D702HS Telephone IP Phones & 5.8GHz 900MHz Cordless Phone ONLY WORKS FOR SOME SPECIFIC PHONES. SEE COMPATIBLE PHONE LIST IN DESCRIPTION, BUY THE ITEM TODAY IF YOU HAVE ONE OF THE PHONE MODELS LISTED BELOW. Superior quality sound with the flexible adjustable noise cancellation microphone. Direct connect over the head headset headphone, No additional amplifiers or adapters required, Most easy setup headset solution. In-line Mic Mute / Volume Control built in. Super Lightweight, Super Durable Headset with Comfortable ear and mic cushions.