Knocking off a star for this reason and also because instructions could be better. Again, these are good if you have wide feet. I received a box full of clay! So I got this mouse for the software built in. This charger doesn?t generate heat at all, and the charging is fast. They replace a similar product made by gold, Which lasted less than 2 months before sole/heel wore through. These men?s boots fitted a size 3, 70+ Yr old lady perfectly and comfortably! No need to do that get standard shoe size. Ill see once I break it in a bit. For me, I wish the battery life was a little better.