Compatible With : Plantronics CS 510, Plantronics CS 520, Plantronics CS 540, Plantronics MDA200, Plantronics Savi Office WO100, Plantronics Savi Office WO200, Plantronics Savi Office WO300, Plantronics Savi Office WO350, Plantronics Savi W710, Plantronics Savi W720, Plantronics Savi W730, Plantronics Savi W740, Plantronics Savi W745, Plantronics Savi 700 Series, CS500 Series, CS500 CD Series, MDA200, Savi Office and Voyager Legend CS