Some additional information:
The system creates a copy of one of your BMW Keyfobs, stores it in the RS internal memory, and it uses this to access the security and start features as if you had placed a
BMW keyfob in the slot.
Your X will see the RS as Key#3 (assuming you have 2 keys) so you don't need a key to drive away. Just unlock the doors with the remote button and you can drive away with no BMW keyfob needed. So, it kinda provides CA Start for those who don't have it, as far as the engine start process is concerned. (You will need to insert your
BMW keyfob in the slot periodically to charge it, if you don't have CA.) You will have to set your seat, mirrors, audio, climate, etc once you use the RS, as they will be stored with key #3. Your settings for #1 and #2 won't change at all.
It doesn't mess with CA at all, still functions as normal after the engine is running but not during the start process itself (only a few seconds). You will of course have to have a BMW keyfob with you to use it as normal for the doors/locks... In this case it will use the settings for the #1/#2
keyfob as usual.