This key programmer is suited for M. Benz models:  W140, W163 from 1995 to 2000 that have "DAS BOX" or "AAM BOX". It can Read the data of DAS & AAM, and then Write it into a new key or key-chip.   Please take note that a key or key - chip can be written just once and can not be rewritten. That means the old key can not be programmer again .The key or key-chip which you want to be programmed must be new. With this programmer, all lost or stolen keys can be replaced with new programmed keys.   Features:  Read the information from DAS & AAM and Program keys  Support MCU type: 0D53J, 0D69J, 0D62J, 0G47V  Support transponder type: PCF7935, PCF7930