The date code of the Supra Plus SL family of headsets will be located on the speaker, under the ear cushion.  If a binaural model, the code will be on the microphone side.  The first number represents the month (01=January, 02=February…).  The two numbers following the dash represent the year (05=2005).  Next is the model of the headset.  An “H35″ represents the Supra Plus SL H351 model and “H36″ represents the Supra Plus SL H361 model.  If an “N” is present, the headset is a noise-canceling model.  If an “R” is present, the headset has been re-manufactured or replaced by Plantronics.

The date code of the Encore family of headsets will be located on the speaker, under the ear cushion.  If a binaural model, the code will be on the microphone side.  The first number represents the month (1=January, 2=February…).  The two numbers following the dash represent the year (05=2005).  Next is the model of the headset.  An “H9″ represents the Encore H91 model and “H10″ represents the Encore H101 model.  If an “N” is present, the headset is a noise-canceling model.  If an “R” is present, the headset has been re-manufactured or replaced by Plantronics.  Any trailing characters are used by Plantronics for coding purposes.

The date code of the DuoPro family of headsets will be located under the ear cushion.  The first two numbers represent the month (01=January, 02=February…).  The two numbers following the dash represent the year (04=2004).  Next is the model of the headset.  An “H7″ represents the DuoPro.  If an “N” is present, the headset is a noise-canceling model.  If an “R” is present, the headset has been re-manufactured or replaced by Plantronics.  Any trailing characters are used by Plantronics for coding purposes.

The date code of the Freehand family of headsets will be located on the side of the headset microphone boom, near the speaker.  The first two numbers represent the month (01=January, 02=February…).  The two numbers following the dash represent the year (05=2005).  Next is the model of the headset.  An “H13″ represents the Freehand.  The Freehand H131N will have a quick disconnect connection at the end of the cable and the H132N will have a clear modular plug at the end of the cable.  Both models have the noise-canceling microphone.  If an “R” is present, the headset has been re-manufactured or replaced by Plantronics.  Any trailing characters are used by Plantronics for coding purposes.

The date code of the DuoSet family of headsets will be located on the side of the headset microphone boom, near the speaker.  The first two numbers represent the month (01=January, 02=February…).  The two numbers following the dash represent the year (04=2004).  Next is the model of the headset.  An “H14″ represents the DuoSet H141 model.  If an “N” is present, the headset is a noise-canceling model.  If an “R” is present, the headset has been re-manufactured or replaced by Plantronics.  Any trailing characters are used by Plantronics for coding purposes.