Celebrate the king of the construction world as you build an authentic replica of the largest Cat® bulldozer with the app-controlled LEGO® Technic™ Cat® D11 Bulldozer (42131) set. This large-scale set allows adults to enjoy their "me time" with focused passion. Just like its real-life Cat® counterpart, this model is built in modular sections. You'll love Take control of your bulldozer Use the CONTROL+ app to operate and explore this heavy machine. Use the app to drive and steer. The app delivers realistic movement as you lift, lower, and tilt the blade or raise and lower the ripper. Explore the engineering LEGO Technic buildable models feature realistic movement and mechanics that allow LEGO builders to explore engineering concepts in an approachable and realistic way. Build a powerful construction vehicle packed with detail with the massive, app-controlled LEGO® Technic™ Cat® D11 Bulldozer 42131 model building set for adults. Use the CONTROL+ app to operate your bulldozer. Bring the bulldozer model to life as you drive and steer, then lift, lower, and tilt the blade or raise and lower the ripper. Looking for the best gifts for yourself or any fan of Cat® bulldozers and other cool vehicles? This impressive construction vehicle set makes a top gift idea. This Cat® replica measures over 10 in. (26 cm) high, 22 in. (57 cm) long and 14.5 in. (37 cm) wide . Requires 6 x AA batteries (not included). The set also includes 2 x L-motors, 2 x XL-motors and 1 x hub. The detailed Cat® model is finished with authentic colors and graphics that Cat® fans will love. The LEGO® Technic™ world offers advanced buildable models for LEGO fans who are looking for an immersive building challenge. LEGO® Technic™ components meet rigorous industry standards to ensure they are consistent, compatible, and connect reliably every time . Set condition: Used and very clean Box and instruction catalog are present