By assembling a number of accessories into a sound and light mixing car and a deforming dinosaur egg screwdriver, let children learn engineering structure, exercise mathematical thinking in the hands-on assembly, increase the new play and fun experience in the twist! The other four engineering vehicles can be assembled together, which will add more surprises to the play. Assemble - transform - combine into a cool urban architecture Tyrannosaurus Rex, simulating the sound effect of Tyrannosaurus Rex, and its legs and feet can slide.