Soundsmith Aida

I just received and mounted a new Soundsmith AIDA. Very impressed so far. It came with a golden "key" marked A-.  What is this for?
Ask Peter Lederman, maker of Soundsmith carts.
I recently purchased the same cartridge.  The "key" is a USB drive with information on installation, set-up, cleaning, etc.
Thanks Steven! You saved me from waiting 'til Monday to ask Soundsmith.