Computerized Hand-Stitch Sewing Machine Introduction · LCD display, clear image · Computer-controlled sewing length and number of stitches · Computer-controlled back-tacking length and number of stitches · Starting back-tacking, ending back-tacking knee pedal · More sewing patterns available, programmable. · Corner thread unhooking · Computer-controlled stitch length · Manual or automatic thread trimmer · Hooked needle (no need threading) · Various numberings of sewng thread accepted. · Thread tension is adjustable by requirement, adjust device · Thread trace sewing can be inversed