UNIVERSAL COMPATIBILITY: Four different colors of light up racing cars can attract kids’ attention and make them happy. Each of them is compatible with most bend and flex race track sets, including dinosaur toy track, rainbow track and so on (track inside width should be at least 2.2 inch). Safe and easy For Play - These magic track extra cars are made of eco-friendly, non-toxic plastic materials that are safe for children. These magical racing cars have the switches at the bottom or at the top. The child can easily use it independently and have fun. Each toy car requires 2 AA batteries (NOT included). We suggest you buy the rechargeable battery to save battery cost. Funny DIY stickers included - Kids can decorate their cars with funny stickers, suitable for the transparent body, making the car attention-grabbing and special make. Best Gift for Kids - Different colors of light up racing cars can attract kids’ attention and make them happy. Parents can interact with children by