This Electronic Hook Switch (EHS) adaptor lets you remotely answer and end calls away from your desk using the multifunction buttons your wireless headset ear piece.

It is designed to work with the following Sennheiser wireless headsets:  DW Office, DW Office ML, DW Pro 1, DW Pro 2, DW Pro 1 ML and DW Pro 2 ML.

It is compatible with the Avaya 1400 series, 9400 series and 9500 series telephone models.