Comdio 2.5mm Call Center Telephone Headset Headphone with Mic + Volume Mute Controls for Panasonic KX-NT136 KX-NT343 KX-NT346 KX-NT366 KX-T7603 IP and Cordless Phones with 2.5mm Headset Jack (H203VP4) 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. 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. Super Lightweight, Super Durable Headset with Comfortable ear and mic cushions. In-line Mic Mute / Volume Control built in.