Xtool M821 mercedes-benz all key lost communication adapter is used for finishing and optimizing all key lost programming for multiple Mercedes-Benz modules.With M821 adapter, you can save as much as 65% of the calculation time on the process,or save you from plugging the key emulator in and out for hundreds of times
This adapter simply replaces the standard OBD2 Connector on the Xtool tablets' main data cable. No other software or hardware is required, once installed the adapter can be used with existing software and can be interchanged with the standard OBD2 connector.