Comdio 2.5mm Call Center Telephone Headset Headphone with Mic + Volume Mute Controls for Polycom SoundPoint Pro Zultys Technologies AT&T SB67158 SB67148 SB67138 SB67118 SB67108 IP Phones (H103VP6) 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.