So I was really upset when I first opened this product and the metal part that the battery has to be touching just kind of fell out on the floor. I thought, "No big deal, I'll just slide it back together and it'll be fine." Not so much.I was bummed because I had read such AMAZING reviews on the product, so I decided I'd try folding up a piece of aluminum foil and tuck it in the end to not only sandwich the metal piece in, but take away any "free" space for the battery to float around inside.IT WORKED. And oh my gosh, was this a beautiful investment or what!! I also love that it comes with the 4 attachments. The only complaint my fiance has about the heads is that all but the very rounded one are kind of pokey and hurt his member. Doesn't mean I can't use them solo ;-]IF YOURS HAS THIS SAME ISSUE UPON ARRIVAL (metal clip falling out) TRY THE LITTLE PIECE OF ALUMINUM FOIL AS A HACK BEFORE YOU TOSS IT IN THE TRASH AND WRITE A TERRIBLE REVIEW FOR IT!