Battery for 96/ A6Q Key Clicker ???....

hi folks.....

need your expertise again.....

just found 1 of the ORIGINAL 2 button key fob clickers down beside the seat in my 1996 A6Q....wow

haven't seen one of these since ???? well...anyways....anyone have an idea what kind of Button cell I need to power this....

I took battery out years ago to bring to Radio Shack....mmmm....now a couple of yrs later....do you think I could find the battery i bought....somehow it never got installed in my new found one....So no clue...

I just hope I don't have to go back to dealer for this.....not worth the hassle and expense

All help....much appreciated

thanks... tiv