Anyone who loves powerful toy trucks and construction toys will have lots of fun building this LEGO Technic 4×4 Mercedes-Benz Zetros Trial Truck (42129) model. Packed with realistic features . this truck toy offers an engaging build for adults and kids aged 12 and up. Open the cab doors and hood. Check out the working suspension on all 4 wheels and open the service hatch to inspect the gearbox. The model also features a detailed engine with spinning radiator fan. In a first for LEGO Technic . this model has differential locking. Lock and unlock the differentials using the app to maneuver the truck over rough terrain. With this model . the build is just the start. Use the CONTROL+ app to put this mighty machine to the test. Use the different control screens to steer and operate the differential locking. With challenges and achievements in the app . there are so many ways to play.