FLOOR & WALL MODE: The unique design of the vacuum system allows this RC car to climb and run fast and steady on any flat and smooth surfaces. FLOOR mode: turn the car switch on the position of “FLOOR”, the car can race on the flat ground. WALL mode: turn the car switch of on the position of “WALL”, the RC car can climb up the smooth surface such as walls, glasses, windows, mirrors, closets and so on.