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How Date Codes Work

All DEI alarms where either stamped or imbedded with a manufacturers Date Code both on the outer
main brain case, and inside the main case. The Date Code tells when the unit was manufactured
which determines the proper replacement remote needed that is compatible with your system. Usually
there is a white sticker that has, for example, OK/8F.  The "OK" means that the unit has passed inspection.
The "8" signifies that the unit was manufactured in 1998 and the "F" signifies the month of June.
Below is charts to determine the Year and Month the unit was manufactured. Once you have determined
the correct Make, Model and Date code, you can find your correct replacement remote Here.
Jan Feb March April May June July August Sept Oct Nov Dec
A B C D E F G H I J K L

Serial number system The 3rd and 4th to last characters in the serial number is the date code for that particular unit.
The LETTER identifies the month the unit was built and coordinates with the following chart:

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