Base Date Code
The Date Code location is a 4 digit number in the lower right hand corner of the label on the bottom of the base. It is in mmyy format.
WH300 Headset Date Code
The two character Date Code for the WH300 headset is located under the ear cushion on the same side of the headset as the microphone boom. It is at the end of the second line of text, and consists of one letter and one number (e.g., C1).