LEGO Technic buildable models feature realistic movement and mechanisms that introduce LEGO builders to the universe of engineering in an approachable and realistic way. Get ready for an easy and intuitive building adventure with the LEGO Builder app. Here kids can zoom in and rotate models in 3D, save sets and track their progress.Monster truck gift – Kids can build and race this LEGO® Technic™ Monster Jam™ Dragon™ (42149) toy truck. With pull-back action, this 2-in-1 toy gives them hours of playDesigned for role play – Kids use the pull-back feature to send the truck racing along before recreating cool monster truck jumps and tricks2-in-1 toy – When they’re ready for a new challenge, kids can rebuild the model into a Crocodile Buggy with pull-back actionDragon™ graphics – Kids can decorate their Monster Jam™ truck with sticker graphics that recreate the design of the real-life Monster Jam truckFor kids aged 7+ – A great introduction to building and engineering for young Monster Jam™ fans. Makes a fun birthday, holiday or anytime gift for truck fansSized for play – This Monster Jam™ truck model measures over 4.5 in. (12 cm) high, 7 in. (19 cm) long and 4 in. (11 cm) wide