There is a ball that when it moves it plays music and lights up. He has really been enjoying that one. I have it down on his play mat and whether intentional or accidental, he tends to hit it often.
He also got a book that sings and lights up. So much fun for our little guy.
A present that is as much for me as for him, his walker! I love having this thing! He wasn't sure about it when I first put him in it.