PUSH AND GO (FRICTION POWERED): The Police Car travels on its own – simply give it a few pushes and let go to watch it roll forward in a hurry! For optimal performance the wheels work best on a smooth surface. No assembly required – toy police car is ready to use right out the box.REALISTIC, SAFE, AND DURABLE: The police car is crafted with realistic features to enhance the fun and have your child playing for hours. The trunk can open by pressing the white button on the top.