We don't always appreciate the automatic buttonhole function. It really is a brilliant simplification and time saver. We place a button in the foot, press the speed regulator and the machine will sew a buttonhole for this button. It will do it in a complete way, i.e. bolt + overcast + bolt + overcast. The buttonhole is made perfectly, or you can adjust the so-called balance, i.e. the density of the hemming of the left or right side for the perfect effect. This type of machine can be found in Husqvarna E20 or Redstar R20 machines from the simplest models. Of course, it is always found in high-end or electronic machines. It is definitely worth considering when buying a machine, whether it is worth investing in such comfort, especially since the price difference is small!