Plantronics SupraPlus and Polaris Headset Models

SupraPlus SL Models H351, H351N, H361, and H361N

Polaris Models P351, P351N, P361, and P361N

The date code is under the ear cushion and is represented by four numbers for the month and year.  In the example below, 01-05 stands for January 2005.