Plantronics SSP1051-03 Push-to-Talk (PTT) headsets Adapter address the need for security in environments where background conversations must not be over heard on the telephone. With this Plantronics PTT adapter on your headset any conversation can be conducted without the worries of eavesdropping. PTT solutions are also recommended for environments with loud intermittent background noise. Plantronics SSP1051 is a Push-to-Talk headset adapter for use with many 4-wire applications.