I was very excited when I bought the First Years Massaging Action Teether. The handle rattles, and there is a little thing on the end of the handle for the baby to spin. It's a little heavy, but it's the first one I have ever seen that vibrates. There are two points are the star that make it vibrate. I thought this was a great idea, but my daughter still can't do it. Even if she does get the right part of it in her mouth, she cannot bite down on it hard enough to make it vibrate. I have to put it in her mouth and squeeze it for her. It's a little frustrating, but I'm hoping she will be able to do it when she gets older. I do wish it was a little lighter. My daughter is 6 months old, and she still has trouble controlling it enough to get it in her mouth. This might be better for older babies, but the packaging says the recommended age is three months and up. My daughter does love the vibrations when I squeeze it for her.