Bought two sets for our children. Christmas day, they open them and imediately wanted to play with them. Set up the tracks, put in 3 fresh batteries in each car and within 30 minutes, both cars' led lights stopped working, (crazy because led's last a crazy amount of time!), and the batteries were dead within 40 minutes. Now, they are just sitting, collecting dust because each time we replaced with fresh batteries, they seemed to die faster than the previous ones. Totally disappointed and extremely angry. I don't like getting ripped off.