eBay

The 939 lockout key cards have been discontinued for some time, and are almost impossible to find or buy.

These cards I have are precision crafted, solid metal reproductions of the original card.

The key card will produce the exact unlock pattern, using the internal light emitting diodes, to give you temperature changing function.

So if you have been locked out, or bought a 939 without a card. I have a few extras that are hand milled, tested, and work perfectly.