Wantek Dual Ear Call Center Telephone Headset with Mic + Volume Mute Controls for Grandstream Cisco Linksys SPA Polycom Panasonic Zultys Gigaset AT&T TL88002 with 2.5mm Headphone Jack(H120S04J25) Only works for some specific phones with standard 2.5mm headset Port. SEE COMPATIBLE PHONE LIST IN DESCRIPTION, BUY THE ITEM ONLY IF YOU HAVE ONE OF THE PHONE MODELS LISTED BELOW. 2.5mm Jack Direct connect headband telephone headset headphone, No additional amplifiers or adapters required. Superior Call Center quality sound headset with flexible adjustable noise canceling microphone. Super Lightweight, Super Durable Headset with Comfortable ear and mic cushions for all day use. With Mic Mute / Volume Control built in. 2.5mm headset, only compatible with phones with 2.5mm headset jack.