Now, jumping any vehicle is a breeze thanks to the Mychanic Smart Booster Cable. Built-in LED voltage meter gives you real-time voltage levels. Reverse polarity indicators prevent incorrect connection. 12-ft. tangle-resistant cables make for easy use in almost any position. Copper-clad aluminum construction. Rated for temperatures down to -13F. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Jumper Cables.