Answer and end calls adjust the volume or mute a call up to 350 ft. from your desk with this electronic hookswitch adapter. Simple plug-and-play solution that converts from the EHS standard used in Avaya phones to the DHSG protocal used in all Jabra wireless office headsets. Improve work efficiency and ergonomics throughout the day with wireless freedom. Features: N/A Connecting Types: N/A For Use With: Jabra GN9350e Jabra GN9125 FLEX Jabra GN9125 DUO Jabra GN9330e Accessory Type: N/A.Unit of Measure : Each