Callez H403G1 Binaural Call Center Headset Headphone with Mic for Avaya 1608 1616 9620 9630 9640 9640G and 9650 and Cortelco Fanvil C58 C58P C62 Altigen 805 Telephone IP Phones 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. Super Lightweight, Super Durable Headset with Comfortable ear and mic cushions. Direct connect over the head headset headphone, No additional amplifiers or adapters required, Most easy setup headset solution. Superior quality sound with the flexible adjustable noise cancellation microphone. NO Mic Mute / Volume Control built in.