Discover how a Jet Engine Really Works! Build your very own working model, with spinning turbo fans and a variable speed control. Built as though hanging beneath a wing the Jet Engine's speed can be controlled by the handle built into the base. Using the simplified instructions in an original Haynes manual, piece together all the needed parts to build an engine with movement, lights and sound. Batteries required: 4 x 1.5v C (not included) Box Size: 30 x 42 x 11 cm