Why do a few of the CCR models have a slot for a smart card? I can only think that they could be used for user authentication, but I don’t know why you’d need to do that.
You know the use of search function?
It was enough to put what you wrote in the title as a search.
Before your topic was the second result.
http://forum.mikrotik.com/t/ccr1009-8g-1s-1s-smart-card-and-certificates/99207/1