Mercedes Keys

Visit this site http://www.yelp.co.uk/biz/auto-key-group-london for more information on Mercedes Keys.Mer keys come with added security since they come with a microchip within them. Through the car key programmer, the key is coded with respect to the car's ignition code such that the serial number of its chip is unique, and therefore it can't be duplicated at all. When you input the code of the transponder key, it will validate the actual code of the chip, but if the serial number does not match the code of the ignition switch, your car won't start.