hgasser9 years ago000What is the diameter of the button?Show in original language (German)UlrichLeuenberger9 years ago000 Helpful answerthe diameter is 17mmShow in original language (German)CommentAnonymous9 years ago000i can't measure it now but it is compatible with all garmin head diameters, i use it with a garmin montana unitShow in original language (German)Comment