Plantronics M1100 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 H0 on your product, the H is the month of August and the 0 is the year 2000.
The two character Date Code is located on the same side of the headset as the ear tip. You can find it in the same line of text as the CE. The Date Code consists of the last two characters in that line of text, which is one letter and one number (e.g., H0).