Don't bother!
We received 4 of these and two didn't work. The first one broke as it was being placed on the toothbrush handle. The second one made it onto the toothbrush handle and the brush spun, but when it was placed against the teeth it stopped spinning.  We didn't even try the other two, and sending it back wouldn't have been worth the price of the stamp. I would give this zero stars if that was a possible selection.
Rating: 1 stars