Review (1/5): SAVE YOU MONEY!  THIS IS JUNK!!
My wife bought one of these for our Golden. When it arrived there was no documentation. We finally discovered how to open the ball we found how to insert the battery and turn it on. The battery lasted less than 5 minutes. After about 10 minutes and a third battery it quit working at all. Too bad because Joe loved it while it did work.
I am not able to advise anyone to purchase this piece of junk. Instead, go outsidemail during a windy day and throw 20$ in the street.