Plantronics APV-63 EHS Adapter (Avaya) Intended for: Phone Designed For: Avaya 2410, 4630, 5410, 6416D+M, 6424D+M; one-X Deskphone Edition 9620 IP Telephone, 9630 IP Telephone, 9640 IP Telephone, 9650 IP Telephone; one-X Deskphone Value Edition 1608, 1616; CS 510, 520, 540; Savi W710, W720, W730, W740, W745 Product type: Hook switch