Ive had my intellimouse for like more then a year. Its a fine mouse, no complaints. But underneath it, it says "Intellimouse Optical"

So my question is, how do you know if its 1.1A?
And lets say it isnt, is there a big/noticeable difference?

I actually doubt that if there is a difference between those 2(if they are both different mouses), that I would go look for 1.1A, unless of course the sensor is crap of the "intellimouse Optical"