The new Mercedes device works with smart key (old and new) for the MB cars from 1997 to 2005. You can programme new keys or used keys, and also programme the ones that do not work any more. You need to desolder and read the content of the two CPUs from Electronic Ignition Control Module (EICM), and then load these eeprom content to the programme, then desolder NEC CPU from the key. And solder it to the MB IR key Prog device, select the Number of key and program it. At last, just need to solder all CPUs back to their original places in EICM, and then start the car. You can programme new keys without the cars, only with EIS and steering blocking module. You can read these CPUs with the help of programmer (like ETL programmer, Motorolla CPU 68HC705X16(32)).