This new car set works with any Build a Road construction set. Build a road in your home or classroom play room and add these cool emergency vehicles to your play highway. These new battery-operated mobiles for Kidoozie Build-a-Road sets feature 5 LED lights each. Build a Road Light-Up Cars 2 Emergency Vehicles Set includes a mini fire truck and police car to keep the order on your busy road. Kids can play with these 2 cars alone or with any Build-a-Road series set. Each emergency car in this set is battery powered with real spinning wheels and a child-safe plastic car body. Build a Road Light-Up Cars 2 Emergency Vehicles Set requires 4 AA batteries.