It communication with key via IR and RF in mercedes benz security protocol .( that means that you can use it for all type keys and if there is any new key with private mcu no problem )need only to update . The new Mercedes device working with small key (old and new) using in car since 1997 up to 2005 - without keyless system. You can program newkey (or used) in car and program old key if its not work more.You need read and program eeprom of CPU from Steering blocking module. Desolder and read via programmer two CPU from Electronic Ignition Control Module.Load these eeproms to program.Desolder NEC CPU from the key. Soldering it on the device , select the No. of key and program it. Solder all CPU on their places and start the car. You can program new keys without the car - only with EISand steering blocking module.You can read theese CPU with other programmer. new model small key is available programming all small key model for all years models W220 -W211 - W230 - W203 -W215 - W210 - W209.