Fans of powerful trucks and complex builds will love creating the LEGO® Technic Mercedes-Benz Zetros 4x4 Test Truck. Packed with realistic features, this set offers a challenging and rewarding build for adults and children aged 12 and up. Open the cab doors and hood, inspect the working 4-wheel suspension, and lift the service hatch to explore the detailed gearbox. The model also includes a detailed engine with a turning radiator fan and the differential lock — a first for LEGO® Technic. Lock and unlock the differentials using the app to tackle tough terrain like a pro.

Building is just the beginning. Use the CONTROL+ app to put this powerful machine to the test. Navigate using the various control screens, operate the differential locks, and enjoy challenges and achievements that add endless ways to play.

• Build your own 4x4 test truck – LEGO® Technic Mercedes-Benz Zetros 4x4 Test Truck (42129) is full of authentic details, including fully functional 4-wheel suspension, a detailed gearbox, and differential locks.

• Realistic design features – Includes racing-themed stickers, 2 fire extinguishers, and flags to create obstacle courses for the truck to conquer.

• For ages 12 and up – Ideal for adults and children who love an immersive building and play experience.

• Dimensions – Measures over 8 in. (21 cm) high, 19 in. (48 cm) long, and 7.5 in. (19 cm) wide.

• Powered by 6 AA batteries (not included) – The battery box can be easily removed for quick battery changes.

• Remote-controlled LEGO® Technic set – Features a Smart Hub controlled via Bluetooth®, 3 large motors, and 1 medium motor, all included in the set.

• Challenging build experience – LEGO® Technic construction sets offer complex building fun for enthusiasts ready to tackle a rewarding engineering challenge.

• Premium quality – LEGO® Technic elements meet the highest industry standards, ensuring perfect compatibility and smooth assembly every time — trusted since 1958.

• Safety tested – All LEGO® Technic components undergo rigorous drop, heat, crush, and torsion tests to meet the strictest global safety standards.