This is normally a $799.99 value that you can now receive for only $238.99 The science behind this product works by drawing a tiny amount of current from the vehicle’s battery and impressing into the metal through a contact point. The electrons from the current enrich the metal surfaces of the vehicle and serve to inhibit the corrosion of the iron molecules exposed to oxygen and moisture. The AutoSaver would make a very special gift this holiday season for anyone! Very easy installation just plug into OBD port below steering wheel and your ready to ride rust free! If you have any questions or concerns feel free to message me directly thru Ebay site.. Thank you happy Shopping