Built for extreme conditions, the 4x4 Mercedes-Benz Zetros Trial Truck has enough power to take on the roughest terrain. Now you can build your own LEGO Technic version of this impressive vehicle. Enjoy a challenging build process and then use the CONTROL+ app to drive the truck and operate the differential lock. Place obstacles and use the flags to map out a course. Is this impressive truck letting something stop it?. Anyone who likes powerful trucks will enjoy building this LEGO Technic 4x4 Mercedes-Benz Zetros Trial Truck (42129) model. Packed with realistic features, the truck offers adults and children ages 12 and up an engaging building experience. Open the cab doors and hood. View the working suspension on all 4 wheels and open the service hatch to see the gearbox. The model has a detailed engine with rotating radiator fan. This model has a limited slip differential for the first time in LEGO Technic history. Block and unblock the differentials using the app to maneuver the truck over rough terrain. Building is just the beginning. Use the CONTROL+ app to put this impressive vehicle to the test. Use the various control screens to steer and operate the differential lock. With all the challenges and achievements in the app, this set offers many play options.