In addition to Volkswagen CC, which is considered to be the most beautiful model of Volkswagen, the borderless door cars designed by Volkswagen include Beetle, ESO and Volkswagen (imported) Scirocco. Frameless doors are usually used for convertibles. Because there is no complete door frame for fixing, the car will have a more transparent visual enjoyment after opening. This design is also used for cars that emphasize the sense of movement. However, because the door glass and sealing strip can not be sealed more tightly, its sound insulation effect will be lower than that of the models with framed doors. Frameless doors open for 2-3 seconds, unlike ordinary cars. The frameless door pulls the door handle first, then the on-board computer finds that you have opened the door handle, then controls the glass lifter to lower the glass by 1-2 cm, and then opens the door. When you close the door, you usually put down the glass when you open the door, so the action of closing the door is simple and direct, but the computer will automatically lift the glass after closing the door.