What is RTR in the remote control model? What is KIT?

Remote control model RTR can be simply understood as a set, with remote control, electronic equipment, frame, as long as the power, refueling can run, KIT can be understood as the assembly version, so to speak, the four-wheel drive car played in childhood is also called KIT version, ha ha, KIT version of the car mainly includes frame, power, tram is the motor, oil car is the engine, frame is a piece, need to assemble, buy back to need. It requires electronic equipment, remote control, batteries or oil to run.