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. Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website