Peggys Electric Stitch Eraser 7 - The The First Cord/CORDLESS Embroidery Thread Remover - Cordless or plug it into an outlet 3.6 volt NmH "Nickel Metal Hydride" batteries Extended usage between charges Eliminates out-of-reach electric outlets No tripping over extension cords Low voltage usuage- enhanced safety feature.  NOTE:  Stitch Eraser is great for removing small embroidery errors.  Completed embroidery designs are almost impossible to remove.