Plantronics EHS APC-82 Electronic Hook Switch Adapter (201081-01) Intended for: Phone Designed for: Plantronics Mda200; cs 510, 520, 530, 540; save W710, w710-m, W720, w720-m, W730, w730-m, W740, w740-m, W745, w745-m; savi Office Wo100, Wo101, Wo200, Wo200/a, Wo201, Wo300, Wo350 Product Type: Electronic hook switch Adapter