ITEM NAME:Kids Educational Science Toys Electric Keep Calm Crossing Game DIY K_ roduct Information Materials: Plastic Weight: 56 g Dimensions: 11 x 7 x 10 cm Packaging Dimensions: 16 x 14 x 3 cm Product Packaging: OPP Plastic Pocket(not includes battry) Recommended Ages: 4 Years and up Features: A very fun science toy, kid can assemble it with parents. Keep calm going though. If the circle touches the track, the light will be lightend. Promote child's hand-on skill. Suitable for physics class experiment and children's extracurricular science activity. Kids can study physics knowledge by playing this DIY game. Kindly reminders: Please make sure the steps and accessories have been understood before starting assembly. It will be better if parents can assemble with kids. Note: If you have any questions about the.Keep calm going though. Promote child's hand-on skill. A very fun science toy, kid can assemble it with parents. It will be better if parents can assemble with kids.