Electronic Hook Switch- communicates electronically with the phone. For use with the CS60, CS70N, CS351N and CS361N headsets on the Avaya 2420, 4610, 4610SW, 4620, 4620SW, 4621SW, 4622SW, 4625SW, 4630SW, 5420, 5610 and 5620
Learn more about Plantronics APV-6B EHS (83682-01)