These are factory refurbished units, that have been rebuilt by our trained technicians and available for purchase at a discounted rate. These will come with a 90-day guarantee. The 'X' at the end of the part number designates htat your ordered product could come in any of our LED colors, red, green, or blue. You are not able to designate your preferred LED color choice on the refurbished parts. If you have a specific color request, you must order the brand new units RA003B, RA003G, or RA003R. Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. Full power delivery all the time without factory warranty concerns. *It is suggested the device be unplugged if the vehicle is not being driven daily or left for a few days. There may be a power draw on the battery in some applications.