Sega Mega Drive 2 - red or grey start controller difference

Hi Im looking at buying a Sega Mega Drive 2 tomorrow but the one I have seen has 2 controllers with grey start buttons, all the others have red start buttons does this mean its an older model or something? I cant find anything explaining why some controllers have grey and some red start buttons. (the controllers are 3buttons btw).

Its £40 for the system with 2 controllers and 3 games so not a bad price but want to ensure the controllers are mega drive2.

Thanks

 

Just means they are US model controllers. Japanese has a blue button, Europe has Red button. These are six button controllers correct? o and there's no difference in performance either.

 

If memory serves we had red and grey. Red was md2, grey was md1

 

thanks guys thought it was maybe something regarding model. Ordered another one anyway with the red buttons. Just got to wait now !