Fine finishing of button holes.
The sewing machine has a very accurate system for moving the fabric, thanks to a special motor, which helps create stitches that are exactly right every time. This is especially good when sewing fast with heavy materials. Also, this system is so smart that it doesn’t need to find its starting position each time.
The parts of the machine that loop the thread and control how much thread is used have been improved. Because of this, problems like missing stitches or the thread not being tight enough happen less often, no matter what type of thread you use. The machine can sew a wide range of materials without issues.