Date Codes for Plantronics Voyager units

B is for the Base, the 2nd Letter = the month the unit was manufactured;

A=Jan,

B=Feb,

C=March,

D=April,

E=May, F=June,

G=July,

H=Aug,

I=Sept,

J=Oct,

K=Nov,

L=Dec.

The first number in the group = the year the unit was manufactured, for example BL713984 = Dec of 2007.