As for Mercedes-Benz key programming, which one should you take? Ak500 key programmer or Ak500 pro key machine? Products AK500+ key programmer AK500 Pro key programmer Figure Read & write EIS Yes, no issues on HC705/HC908/HC912/9S12 Yes, no issues on HC705/HC908/HC912/9S12 MB original factory key calculator No Yes Remove ESL/ESM/ECU Yes, it needs to remove ESL/ESM/ECU to synchronize data No need to remove ESL/ESM/ECU Support calculating key only need EIS data Write old model big keys No, it doesn’t support…