5 in 1 set.. Pull back / Turn / Detachable: just push the big truck forward a few times and let go, and it will set off with four small cars! The head of the large carrier can also be turned. Once there, you can separate the truck cab from the trailer and open the tailgate to unload the mini. Pull the carts back, then let go of your hand and they will run on their own. Lights and Sound Effects - Press the button on the top of the cab and you can see bright flashing lights and hear realistic sirens, very attractive for kids. Enhance children's play fun. Rest assured, the sound will only last about 8 seconds each time the button is pressed…brand new in the box..