Have no idea how this thing works. Looks to be in good condition and it only comes with the unit in picture.

Add a professional touch and precision to your sewing projects with this Singer Buttonholer 160743. This attachment is compatible with Singer sewing machines and is ideal for those who love to create beautiful and unique designs. The Buttonholer is made from high-quality materials and is easy to install, ensuring that you can get started with your sewing projects right away. It is perfect for crafting, sewing, and other machine parts and attachments. Make your sewing projects stand out with this Singer Buttonholer 160743. Order today and enjoy fast and free shipping!