Hi all, as per my introduction post, happy bunny here got me a C180 sport in A1 condition today but have a small problem. In the owners wallet is a red key type thing and on the key fob is a black one, any idea what it is? i am thinking maybe alarm or immobiliser as there are a couple of sensors by the windscreen but no idea where it plugs in, what it is or even what make it is. If anybody can give any advice it would be really appreciated. Dealer i bought it from had no idea.