High-precision automatic buttonhole function Sew buttonholes with precise accuracy! With the BERNINA 350 PE’s automatic buttonhole function, it could hardly be simpler: the preset buttonhole length is stored in the internal memory, letting you sew buttonholes of the exact same length as often as you wish. Here the BERNINA 350 PE solves a difficult problem, since sewing identical buttonholes can be a bit tricky. With the BERNINA 350 PE, broken bobbin thread or buttonholes of different lengths are things of the past: the automatic buttonhole function gives you perfect results in no time flat. The BERNINA 350 PE gives you a choice of two permanently programmed buttonhole styles to ensure that even beginners simply and nearly effortlessly achieve optimal results that will stand up to the most critical scrutiny.