1. this is a ripsaw bush (caterpillar all-terrain vehicle) assembled from models 42100 and 42082 and a few additional parts (1637 parts). Control with the Controlz app, but you can easily customize your favorite control app. Propulsion and steering are provided by 4 L motors and 2 XL  motors and two Control+ hubs. The model has a working V12 engine, there are two working control levers in the cab.

   The cab door and the engine compartment cover open manually.
   on the main gearboxes there are reductions 28/20
   On the gearboxes of the caterpillars there is a gear 12/12, you can easily change to a decrease in 24/8, 20/12 or an increase in 12/20, or even 8/24 with additional gears

After the purchase, a high-quality and interesting pdf instruction and instructions for setting up the ControlZ application will be available for download.