Discover how a jet engine works, build your very own working model. Spinning turbo fans and a variable speed control. Speed can be controlled by the handle built into the base. Using the simplified instructions, piece together over fifty parts to build an engine with movement, lights and sound. Working model. Includes: 50+ parts. Size H15, W27.5, . Batteries required: 4 x 1.5V (not included). For ages 3 years and over. Manufacturers 2 year guarantee. WARNING(S): Not suitable for children under 3 years old. Only for domestic use.