Infrared remote controller independently controls the forward/backward movements of 3 DC motors using the battery box receiver and wires.Very detailed and realistic designed construction vehicles can be built. Realistic models that kids may know from the real construction sites and with cool functions that makes it really fun to operate and play. Lots of technical learning aspects in this kit, like the real differential gear that you construct and build in to the models. This makes you learn how vehicles compensate for the outer wheel driving faster than the inner wheel when turning. Real tough models of an excavator, bulldozer, front end loader, road scraper, crane truck, fork lift, tractor, etc.