I think that this is falsely advertised. I remember the days of playing nun chuck and this not what I had excepted.

I bought these thinking they were like another set of finger chucks we have which light up on their own when moved around. These have to be turned on with a switch and also shut off. First disappointment. Bought these in a hurry because I was tired of three kids fighting over one set, so my mistake. Second disappointment was the pink set not even lighting up at all. One ball lit up for about 20 seconds (out of the box) before it went kaput, the other never worked. Third disappointment is I’ve had to put the blue set back together twice now with batteries and pieces flying everywhere from normal play. With everything as expensive as it is right now, I’m glad I’m not out a lot of money with this purchase, but I may as well have thrown it in the trash.