LEGO Technic App-Controlled Top Gear Rally Car 42109 Know a race car fan who would love to drive like the Stig from TVs BBC Top Gear? Let them put their skills to the test with this awesome LEGO Technic (42109) App-Controlled Top Gear Rally Car. First, they can have fun building the rally car toy, discovering all the elements that make this Rally Car model work. Then the adrenaline builds as they try out cool moves all using the LEGO Technic CONTROL+ App. Take on challenges in the free LEGO Technic CONTROL+ App. Powered by a smart hub, the app allows super-precise movement, giving endless play combinations with authentic sound effects. Choose from different control screens to drive forward, reverse, steer, accelerate, brake and tackle obstacles. They will also get real-time feedback, including a speed and tilt log and can test out their skills in the app's racing challenges section. There's inspirational content and videos to discover in the app too! The world of LEGO Technic unique toy building sets LEGO Technic sets bring an advanced building challenge for kids and adults who love to learn new engineering skills.