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. Pefect for builders Ages 7+. Requires 2 AA; batteries, not included. Get ready to take-off on an amazing journey with the turbo jet 2-in-1 building set from knex. 2 models in one - jet & heli-plane, both with motorised movement; Over 400 knex parts. Build a turbo jet with motorised, rolling wheels and an open-and-close cockpit; Hen take it apart and build a heli-plane with working, motorised propellers that you can adjust to spin vertically or horizontally. Recommended for builders age 7+. One supplied. Size H25.4, W30.48, D6.35cm. 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.