It uses the machine’s straight stitch setting and moves the fabric side to side to create the buttonhole. They come standard with an assortment of 5 different sized templates in straight and key holes designs. Additional templates are out there, but it does NOT use the same templates as the Professional buttonholer.
There are two monogrammer attachments, but they only work with the 401 and 403. The most commonly available is called the “Professional” monogrammer. It makes smaller letters (about 3/8” high) and works a lot like the professional buttonholer. In fact, it requires the same feed cover plate if you want to use it on the 401 or 403.
The second monogrammer makes larger designs, and it's called the “Deluxe” monogrammer. The challenge with this unit is finding the long, rectangular templates for the various letters. They often only come with a few of the letters as they were sold separately from the monogrammer attachment. People usually only purchased the letter templates they thought that they would use.