1.four-step buttonholing 2.built-in more than 20 patterns 3.positive and backward sewing 4.with 5 kinds of feet ... sewing zipper, darning, buttonholing,buttonholing and sewing buttonSewing function: flat seam, blind sewing, zig-zag sewing, buttonholing, sewing button, sewing zipper, hemmed, overlock and embroidery.Specification Needle ... : G/W 8.6kgs, N/W 7.8kgs Zig-zag Sewing machine ROSA