Plantronics Voyager 815 / 855 Bluetooth Headset Date Codes
The date code of your product designates its date of manufacture, and it can be used to establish your warranty period. The date code is generally listed with your product’s model and part number, although this is not always the case.
The chart below can assist with understanding the date code.
Example: If you see K7 on your product, the K is the month of November and the 7 is the year 2007.