To begin with, all those who simply put stars in their reviews without saying anything, it is better not to write a review because you simply don't help anyone. No matter what product it is, instead of just leaving stars, write something. This product is the most useless thing I have ever bought. I bought 3, one for my wife, one for myself, and one as a gift. And all 3, when we put the batteries in, started burning as if we had a lighter next to them. It never worked, meaning after we put the batteries in, we pressed the button to make it work and it did nothing, no sound, no vibration. So from a certain point on, the controller was like we had set it on fire, so it turned out to be useless. It's better to get something with double the price, so that these things don't happen and you can be sure that nothing will happen to you. If it was just one problem, I would justify it because it could have been a defective one, but all 3 having a problem? I don't think so, either all 3 were defective or I was just unlucky. I do not recommend it at all.