Features Build your own Tyrannosaurus with mechanical movement and swinging arms. Gear drive operation. The unassembled 2-in-1 gearbox provides you with a motor, 2 sets of gears, metal shaft and gearbox. Using the different gear sets will give you different speeds. Supplied with pre-punched board, pulleys, shafts, switch, motor, battery holder and all necessary parts. Easy to follow instructions. A non-soldering kit