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.
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