Okay, I read all (ALL!) of the reviews trying to choose the correct battery operated ride on.  These seemed the most safe bet and I'm relieved I ended up with them.  They worked beautifully so far.  They are probably too old for the girls right now, but they will grow into using them more and the parents won't have to remote control them around so much.  Because of the remote controls, we didn't leave them alone with the dads, who used the phrase "Baby Demolition Derby".  Hahaha...