Red button. Zhongyi buttonhole machine is a favorite product. The buttonhole machine is mainly used to process buttonholes on all kinds of clothes, and it is divided into flat buttonhole machine (straight buttonhole machine) and round buttonhole machine (Phoenix car). The machine is convenient for people to use and can better distinguish the key from other keys, so the key of the machine is a red button. At the same time, this machine is very important in clothing machinery.