Not every part number works !! Can't remember what mine was, but i'm sure I posted it on here somewhere! From memory the P/N's are all the same except the last 2 letters, which is the important bit. There is no issue with Freq, or at least none that have been mentioned on here! As for 2 or 3 button keys...not much point in 3 button, as the boot release wont do anything on an LC.