This refurbished product is tested and certified to work properly. The product will have minor blemishes and/or light scratches). The refurbishing process includes functionality testing?? basic cleaning?? inspection?? and repackaging. The product ships with all relevant accessories?? and may arrive in a generic box.</br></br>Product Description</br></br><DIV></DIV><P>Derived from the classic text originated by Lubert Stryer and continued