2-in-1; Build a supersonic jet, then build a heli-plane with rotating propellers. Over 400 KNEX rods & connectors are included, plus a battery-powered motor. Build a jet with motorised, rolling wheels and an open-and-close cockpit; Then take it apart and build a heli-plane with working, motorised propellers that you can adjust to spin vertically or horizontally. 2 models in one - jet & heli-plane, both with motorised movement; Easy-to-follow building instructions included. Size H25.4, W6.35, D30.48cm. Batteries required: 2 x AA (not included) plus . For ages 7 years and over. WARNING(S): Not suitable for children under 3 years old. Only for domestic use. To be used under the direct supervision of an adult.