Plantronics EncorePro HW291N & HW301N Corded Headset Date Codes The date code of the EncorePro 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 “HW291” represents the EncorePro HW291 model and “HW301” represents the EncorePro HW301 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. Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website