This model adopts servo motor driven directly. Compared with the traditional mechanical structure: 1.Needle position precisely and no brake noise; 2. Accordingly to different fabrics,adjust speed freely so to achieve the best sewing effects; 3. Press key button to change the stitch number 8, 16,32 stitches; Mainly used in the two or four holes buttons, but if changed with sewing clip or add affix, it can apply to other uses.