Anyone who loves powerful toy trucks and construction toys will have lots of fun building this LEGO® Technic™ 4x4 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. WARNING: Choking hazard! Not for children under 3 years of age.